{
  "title": "General_term_of_AP(Arithmetic_Progressions) - Grade 10 CBSE",
  "total_questions": 100,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "The general term of AP is given by:", "options": {"A": "a_n = a + (n-1)d", "B": "a_n = a + nd", "C": "a_n = a + (n+1)d", "D": "a_n = a × (n-1)d"}, "correct_answer": "A"},
    {"id": 2, "difficulty": "easy", "question": "For AP with a=3, d=4, find 5th term using a_n = a+(n-1)d.", "options": {"A": "15", "B": "17", "C": "19", "D": "21"}, "correct_answer": "C"},
    {"id": 3, "difficulty": "easy", "question": "If a=10, d=-2, find 4th term.", "options": {"A": "4", "B": "5", "C": "6", "D": "7"}, "correct_answer": "A"},
    {"id": 4, "difficulty": "easy", "question": "In formula a_n = a+(n-1)d, what does 'n' represent?", "options": {"A": "Common difference", "B": "Term number", "C": "First term", "D": "Sum of terms"}, "correct_answer": "B"},
    {"id": 5, "difficulty": "easy", "question": "For AP: 7,12,17,22,..., find 6th term.", "options": {"A": "27", "B": "32", "C": "37", "D": "42"}, "correct_answer": "B"},
    {"id": 6, "difficulty": "easy", "question": "If a=5, a_n=41, d=4, find n.", "options": {"A": "8", "B": "9", "C": "10", "D": "11"}, "correct_answer": "C"},
    {"id": 7, "difficulty": "easy", "question": "For AP: 100,95,90,85,..., find 8th term.", "options": {"A": "60", "B": "65", "C": "70", "D": "75"}, "correct_answer": "B"},
    {"id": 8, "difficulty": "easy", "question": "If 5th term is 23 and d=3, find a.", "options": {"A": "8", "B": "9", "C": "10", "D": "11"}, "correct_answer": "D"},
    {"id": 9, "difficulty": "easy", "question": "For AP: 1.5, 2.0, 2.5, 3.0,..., find 10th term.", "options": {"A": "5.0", "B": "5.5", "C": "6.0", "D": "6.5"}, "correct_answer": "C"},
    {"id": 10, "difficulty": "easy", "question": "If a=0, d=5, find 7th term.", "options": {"A": "25", "B": "30", "C": "35", "D": "40"}, "correct_answer": "B"},
    {"id": 11, "difficulty": "easy", "question": "For AP: 1/2, 1, 3/2, 2,..., find 5th term.", "options": {"A": "5/2", "B": "3", "C": "7/2", "D": "4"}, "correct_answer": "A"},
    {"id": 12, "difficulty": "easy", "question": "If a_n = 3n+2, find 4th term.", "options": {"A": "11", "B": "14", "C": "17", "D": "20"}, "correct_answer": "B"},
    {"id": 13, "difficulty": "easy", "question": "For AP with a=2, d=0.5, find 6th term.", "options": {"A": "4.0", "B": "4.5", "C": "5.0", "D": "5.5"}, "correct_answer": "B"},
    {"id": 14, "difficulty": "easy", "question": "If 3rd term is 11 and d=4, find 1st term.", "options": {"A": "3", "B": "4", "C": "5", "D": "6"}, "correct_answer": "A"},
    {"id": 15, "difficulty": "easy", "question": "For AP: 0, 3, 6, 9,..., find 12th term.", "options": {"A": "30", "B": "33", "C": "36", "D": "39"}, "correct_answer": "B"},
    {"id": 16, "difficulty": "easy", "question": "If a=10, a_n=50, n=11, find d.", "options": {"A": "3", "B": "4", "C": "5", "D": "6"}, "correct_answer": "B"},
    {"id": 17, "difficulty": "easy", "question": "For AP: √2, 2√2, 3√2,..., find 8th term.", "options": {"A": "6√2", "B": "7√2", "C": "8√2", "D": "9√2"}, "correct_answer": "C"},
    {"id": 18, "difficulty": "easy", "question": "If a_n = 50-3n, find 5th term.", "options": {"A": "35", "B": "38", "C": "41", "D": "44"}, "correct_answer": "A"},
    {"id": 19, "difficulty": "easy", "question": "For AP: -5, -2, 1, 4,..., find 7th term.", "options": {"A": "10", "B": "13", "C": "16", "D": "19"}, "correct_answer": "B"},
    {"id": 20, "difficulty": "easy", "question": "If a=π, d=π/2, find 4th term.", "options": {"A": "2π", "B": "5π/2", "C": "3π", "D": "7π/2"}, "correct_answer": "B"},
    {"id": 21, "difficulty": "medium", "question": "Which term of AP: 3,8,13,18,... is 78?", "options": {"A": "14th", "B": "15th", "C": "16th", "D": "17th"}, "correct_answer": "C"},
    {"id": 22, "difficulty": "medium", "question": "If 4th term of AP is 14 and 9th term is 29, find 15th term.", "options": {"A": "45", "B": "47", "C": "49", "D": "51"}, "correct_answer": "B"},
    {"id": 23, "difficulty": "medium", "question": "For AP with a=2, last term=50, d=3, find number of terms.", "options": {"A": "15", "B": "16", "C": "17", "D": "18"}, "correct_answer": "C"},
    {"id": 24, "difficulty": "medium", "question": "If a_n = 4n+3, is this AP? If yes, find a and d.", "options": {"A": "Yes, a=7, d=4", "B": "Yes, a=3, d=4", "C": "No", "D": "Yes, a=4, d=3"}, "correct_answer": "A"},
    {"id": 25, "difficulty": "medium", "question": "Which term of AP: 21,18,15,... is -81?", "options": {"A": "33rd", "B": "34th", "C": "35th", "D": "36th"}, "correct_answer": "C"},
    {"id": 26, "difficulty": "medium", "question": "If 5th term of AP is 20 and 10th term is 35, find a and d.", "options": {"A": "a=8, d=3", "B": "a=9, d=3", "C": "a=8, d=4", "D": "a=9, d=4"}, "correct_answer": "A"},
    {"id": 27, "difficulty": "medium", "question": "For AP: 7,13,19,..., find which term equals 145.", "options": {"A": "22nd", "B": "23rd", "C": "24th", "D": "25th"}, "correct_answer": "C"},
    {"id": 28, "difficulty": "medium", "question": "If a_3=12 and a_7=28, find a_10.", "options": {"A": "37", "B": "39", "C": "41", "D": "43"}, "correct_answer": "B"},
    {"id": 29, "difficulty": "medium", "question": "For AP with a=1, d=4, which term equals 97?", "options": {"A": "23rd", "B": "24th", "C": "25th", "D": "26th"}, "correct_answer": "C"},
    {"id": 30, "difficulty": "medium", "question": "If a_n = 7-3n, find which term equals -20.", "options": {"A": "8th", "B": "9th", "C": "10th", "D": "11th"}, "correct_answer": "B"},
    {"id": 31, "difficulty": "medium", "question": "For AP: √3, 2√3, 3√3,..., which term equals 10√3?", "options": {"A": "8th", "B": "9th", "C": "10th", "D": "11th"}, "correct_answer": "C"},
    {"id": 32, "difficulty": "medium", "question": "If a=5, a_n=95, d=5, find n.", "options": {"A": "17", "B": "18", "C": "19", "D": "20"}, "correct_answer": "C"},
    {"id": 33, "difficulty": "medium", "question": "For AP: 0.6, 1.7, 2.8,..., find 10th term.", "options": {"A": "9.6", "B": "10.5", "C": "11.4", "D": "12.3"}, "correct_answer": "B"},
    {"id": 34, "difficulty": "medium", "question": "If 3rd term is 4 times 1st term and 2nd term is 9, find AP.", "options": {"A": "3,9,15,...", "B": "6,9,12,...", "C": "5,9,13,...", "D": "4,9,14,..."}, "correct_answer": "B"},
    {"id": 35, "difficulty": "medium", "question": "For AP: 100, 96, 92,..., find first negative term.", "options": {"A": "24th", "B": "25th", "C": "26th", "D": "27th"}, "correct_answer": "D"},
    {"id": 36, "difficulty": "medium", "question": "If a_5=22 and a_15=62, find a_20.", "options": {"A": "77", "B": "80", "C": "83", "D": "86"}, "correct_answer": "B"},
    {"id": 37, "difficulty": "medium", "question": "For AP: 1/3, 5/3, 9/3,..., find 12th term.", "options": {"A": "41/3", "B": "43/3", "C": "45/3", "D": "47/3"}, "correct_answer": "C"},
    {"id": 38, "difficulty": "medium", "question": "If a_8=26 and a_13=46, find a_25.", "options": {"A": "86", "B": "88", "C": "90", "D": "92"}, "correct_answer": "C"},
    {"id": 39, "difficulty": "medium", "question": "For AP: 0.1, 0.4, 0.7,..., which term equals 3.1?", "options": {"A": "9th", "B": "10th", "C": "11th", "D": "12th"}, "correct_answer": "C"},
    {"id": 40, "difficulty": "medium", "question": "If a_n = 2n²+3, is this AP? If not, why?", "options": {"A": "Yes, it is AP", "B": "No, difference not constant", "C": "Yes, with d=2", "D": "No, not linear in n"}, "correct_answer": "B"},
    {"id": 41, "difficulty": "medium", "question": "For AP: log2, log4, log8,..., find 7th term.", "options": {"A": "log14", "B": "log128", "C": "7log2", "D": "log49"}, "correct_answer": "B"},
    {"id": 42, "difficulty": "medium", "question": "If a_7=34 and a_13=64, find a_1.", "options": {"A": "4", "B": "5", "C": "6", "D": "7"}, "correct_answer": "A"},
    {"id": 43, "difficulty": "medium", "question": "For AP: 3/2, 5/2, 7/2,..., which term equals 25/2?", "options": {"A": "10th", "B": "11th", "C": "12th", "D": "13th"}, "correct_answer": "C"},
    {"id": 44, "difficulty": "medium", "question": "If a_3+a_7=30 and a_2+a_8=34, find a_5.", "options": {"A": "15", "B": "16", "C": "17", "D": "18"}, "correct_answer": "A"},
    {"id": 45, "difficulty": "medium", "question": "For AP: 2.5, 5.0, 7.5,..., find 15th term.", "options": {"A": "35.0", "B": "37.5", "C": "40.0", "D": "42.5"}, "correct_answer": "B"},
    {"id": 46, "difficulty": "medium", "question": "If a=3p+1, d=2p, find a_6.", "options": {"A": "13p+1", "B": "11p+1", "C": "9p+1", "D": "7p+1"}, "correct_answer": "A"},
    {"id": 47, "difficulty": "medium", "question": "For AP: √2, √8, √18,..., find 8th term.", "options": {"A": "√128", "B": "8√2", "C": "√98", "D": "7√2"}, "correct_answer": "A"},
    {"id": 48, "difficulty": "medium", "question": "If a_4=0, find relation between a and d.", "options": {"A": "a=3d", "B": "a=-3d", "C": "a=4d", "D": "a=-4d"}, "correct_answer": "B"},
    {"id": 49, "difficulty": "medium", "question": "For AP: 1.1, 2.2, 3.3,..., find 20th term.", "options": {"A": "20.0", "B": "21.0", "C": "22.0", "D": "23.0"}, "correct_answer": "C"},
    {"id": 50, "difficulty": "medium", "question": "If a_n = 5-2n, find which term equals -15.", "options": {"A": "8th", "B": "9th", "C": "10th", "D": "11th"}, "correct_answer": "C"},
    {"id": 51, "difficulty": "medium", "question": "For AP: 1/4, 1/2, 3/4,..., find 10th term.", "options": {"A": "5/2", "B": "9/4", "C": "2", "D": "7/4"}, "correct_answer": "B"},
    {"id": 52, "difficulty": "medium", "question": "If a_6=19 and a_11=34, find a_20.", "options": {"A": "59", "B": "61", "C": "63", "D": "65"}, "correct_answer": "B"},
    {"id": 53, "difficulty": "medium", "question": "For AP: 0, π/2, π, 3π/2,..., find 9th term.", "options": {"A": "4π", "B": "9π/2", "C": "5π", "D": "11π/2"}, "correct_answer": "A"},
    {"id": 54, "difficulty": "medium", "question": "If a_5-a_2=12, find d.", "options": {"A": "3", "B": "4", "C": "5", "D": "6"}, "correct_answer": "B"},
    {"id": 55, "difficulty": "medium", "question": "For AP: -10, -6, -2,..., find 15th term.", "options": {"A": "42", "B": "46", "C": "50", "D": "54"}, "correct_answer": "B"},
    {"id": 56, "difficulty": "medium", "question": "If a=7, a_n=84, d=7, find n.", "options": {"A": "10", "B": "11", "C": "12", "D": "13"}, "correct_answer": "C"},
    {"id": 57, "difficulty": "medium", "question": "For AP: 0.01, 0.02, 0.03,..., find 50th term.", "options": {"A": "0.50", "B": "0.51", "C": "0.52", "D": "0.53"}, "correct_answer": "A"},
    {"id": 58, "difficulty": "medium", "question": "If a_8=2a_4 and a_3=10, find a_1.", "options": {"A": "4", "B": "5", "C": "6", "D": "7"}, "correct_answer": "C"},
    {"id": 59, "difficulty": "medium", "question": "For AP: √5, 2√5, 3√5,..., find 12th term.", "options": {"A": "11√5", "B": "12√5", "C": "13√5", "D": "14√5"}, "correct_answer": "B"},
    {"id": 60, "difficulty": "medium", "question": "If a_n = n(n+1)/2, is this AP?", "options": {"A": "Yes", "B": "No", "C": "Sometimes", "D": "Cannot say"}, "correct_answer": "B"},
    {"id": 61, "difficulty": "medium", "question": "For AP: 3/4, 1, 5/4,..., find 8th term.", "options": {"A": "9/4", "B": "5/2", "C": "11/4", "D": "3"}, "correct_answer": "C"},
    {"id": 62, "difficulty": "medium", "question": "If a_3+a_6=29 and a_2+a_5=26, find a_4.", "options": {"A": "12", "B": "13", "C": "14", "D": "15"}, "correct_answer": "C"},
    {"id": 63, "difficulty": "medium", "question": "For AP: 2.2, 4.4, 6.6,..., find 25th term.", "options": {"A": "55.0", "B": "56.0", "C": "57.0", "D": "58.0"}, "correct_answer": "A"},
    {"id": 64, "difficulty": "medium", "question": "If a=√2, d=√2, find a_10.", "options": {"A": "10√2", "B": "9√2", "C": "8√2", "D": "7√2"}, "correct_answer": "A"},
    {"id": 65, "difficulty": "medium", "question": "For AP: 1/10, 3/10, 5/10,..., find 6th term.", "options": {"A": "9/10", "B": "11/10", "C": "13/10", "D": "15/10"}, "correct_answer": "B"},
    {"id": 66, "difficulty": "medium", "question": "If a_7-a_3=24, find d.", "options": {"A": "4", "B": "5", "C": "6", "D": "7"}, "correct_answer": "C"},
    {"id": 67, "difficulty": "medium", "question": "For AP: 0.25, 0.50, 0.75,..., find 16th term.", "options": {"A": "4.00", "B": "4.25", "C": "4.50", "D": "4.75"}, "correct_answer": "A"},
    {"id": 68, "difficulty": "medium", "question": "If a_n = 100-5n, find which term is 25.", "options": {"A": "13th", "B": "14th", "C": "15th", "D": "16th"}, "correct_answer": "C"},
    {"id": 69, "difficulty": "medium", "question": "For AP: 1/6, 1/3, 1/2,..., find 9th term.", "options": {"A": "4/3", "B": "3/2", "C": "5/3", "D": "2"}, "correct_answer": "B"},
    {"id": 70, "difficulty": "medium", "question": "If a=2.5, d=1.5, find a_12.", "options": {"A": "17.5", "B": "18.0", "C": "18.5", "D": "19.0"}, "correct_answer": "D"},
    {"id": 71, "difficulty": "medium", "question": "For AP: -20, -15, -10,..., find 11th term.", "options": {"A": "25", "B": "30", "C": "35", "D": "40"}, "correct_answer": "B"},
    {"id": 72, "difficulty": "medium", "question": "If a_5=22 and a_12=57, find a_20.", "options": {"A": "85", "B": "87", "C": "89", "D": "91"}, "correct_answer": "C"},
    {"id": 73, "difficulty": "medium", "question": "For AP: 0.3, 0.6, 0.9,..., find 20th term.", "options": {"A": "5.7", "B": "6.0", "C": "6.3", "D": "6.6"}, "correct_answer": "B"},
    {"id": 74, "difficulty": "medium", "question": "If a_n = 3n-7, find a_15.", "options": {"A": "38", "B": "40", "C": "42", "D": "44"}, "correct_answer": "A"},
    {"id": 75, "difficulty": "medium", "question": "For AP: √12, √27, √48,..., find 7th term.", "options": {"A": "√147", "B": "√192", "C": "√243", "D": "√300"}, "correct_answer": "A"},
    {"id": 76, "difficulty": "medium", "question": "If a=0.1, d=0.1, find a_100.", "options": {"A": "9.9", "B": "10.0", "C": "10.1", "D": "10.2"}, "correct_answer": "B"},
    {"id": 77, "difficulty": "medium", "question": "For AP: 2/3, 4/3, 6/3,..., find 8th term.", "options": {"A": "14/3", "B": "16/3", "C": "18/3", "D": "20/3"}, "correct_answer": "B"},
    {"id": 78, "difficulty": "medium", "question": "If a_8=40 and a_13=65, find a_5.", "options": {"A": "20", "B": "22", "C": "24", "D": "26"}, "correct_answer": "A"},
    {"id": 79, "difficulty": "medium", "question": "For AP: 1.25, 2.50, 3.75,..., find 9th term.", "options": {"A": "10.00", "B": "10.25", "C": "10.50", "D": "10.75"}, "correct_answer": "A"},
    {"id": 80, "difficulty": "medium", "question": "If a_n = 50-2n, find which term is 20.", "options": {"A": "13th", "B": "14th", "C": "15th", "D": "16th"}, "correct_answer": "C"},
    {"id": 81, "difficulty": "hard", "question": "If pth term of AP is q and qth term is p, prove that (p+q)th term is 0. For p=5, q=8, verify.", "options": {"A": "13th term=0", "B": "12th term=0", "C": "11th term=0", "D": "10th term=0"}, "correct_answer": "A"},
    {"id": 82, "difficulty": "hard", "question": "If m times mth term equals n times nth term of AP (m≠n), prove that (m+n)th term is 0. For AP 2,4,6,... with m=3,n=5, verify.", "options": {"A": "8th term=0", "B": "9th term=0", "C": "10th term=0", "D": "11th term=0"}, "correct_answer": "A"},
    {"id": 83, "difficulty": "hard", "question": "If S_n = 3n²+2n, find a_n (nth term).", "options": {"A": "6n-1", "B": "6n+1", "C": "6n-2", "D": "6n+2"}, "correct_answer": "A"},
    {"id": 84, "difficulty": "hard", "question": "If sum of p terms = sum of q terms (p≠q), prove that sum of (p+q) terms = 0. For AP 3,5,7,... find p,q such that S_p=S_q.", "options": {"A": "p=4,q=6", "B": "p=5,q=7", "C": "p=6,q=8", "D": "p=7,q=9"}, "correct_answer": "C"},
    {"id": 85, "difficulty": "hard", "question": "If a,b,c are in AP, prove that 1/(√b+√c), 1/(√c+√a), 1/(√a+√b) are in AP. For a=1,b=4,c=7, check.", "options": {"A": "Yes, they are in AP", "B": "No, they are not in AP", "C": "Sometimes", "D": "Cannot determine"}, "correct_answer": "B"},
    {"id": 86, "difficulty": "hard", "question": "If a_n = 2n+3, find S_n. Then from S_n find a_n again to verify.", "options": {"A": "S_n=n²+4n, a_n=2n+3", "B": "S_n=n²+5n, a_n=2n+3", "C": "S_n=2n²+5n, a_n=2n+3", "D": "S_n=2n²+4n, a_n=2n+3"}, "correct_answer": "A"},
    {"id": 87, "difficulty": "hard", "question": "If ratio of sums of m and n terms is m²:n², find ratio of mth and nth terms.", "options": {"A": "(2m-1):(2n-1)", "B": "(2m+1):(2n+1)", "C": "m:n", "D": "m²:n²"}, "correct_answer": "A"},
    {"id": 88, "difficulty": "hard", "question": "If a,b,c are in AP, prove that a²(b+c), b²(c+a), c²(a+b) are in AP. For a=1,b=2,c=3, verify.", "options": {"A": "5,16,33 in AP", "B": "5,14,33 in AP", "C": "5,16,35 in AP", "D": "5,14,35 in AP"}, "correct_answer": "A"},
    {"id": 89, "difficulty": "hard", "question": "If pth, qth, rth terms of AP are a,b,c respectively, prove that a(q-r)+b(r-p)+c(p-q)=0. For AP 2,5,8,... with p=1,q=2,r=3, verify.", "options": {"A": "0", "B": "1", "C": "2", "D": "3"}, "correct_answer": "A"},
    {"id": 90, "difficulty": "hard", "question": "Find a_n if S_n = an²+bn. Prove that it forms AP.", "options": {"A": "a_n=2an+(b-a)", "B": "a_n=2an+(a-b)", "C": "a_n=2an+b", "D": "a_n=an+b"}, "correct_answer": "A"},
    {"id": 91, "difficulty": "hard", "question": "If a,b,c are in AP, prove that (a+2b-c)(2b+c-a)(c+a-b)=4abc. For a=1,b=2,c=3, verify.", "options": {"A": "LHS=24,RHS=24", "B": "LHS=20,RHS=24", "C": "LHS=24,RHS=20", "D": "LHS=20,RHS=20"}, "correct_answer": "A"},
    {"id": 92, "difficulty": "hard", "question": "If 1/a, 1/b, 1/c are in AP, prove that (b+c)/a, (c+a)/b, (a+b)/c are in AP. For a=1,b=2,c=3, verify.", "options": {"A": "5,2,4/3 in AP", "B": "5,2,5/3 in AP", "C": "5,2,2 in AP", "D": "5,2,1 in AP"}, "correct_answer": "B"},
    {"id": 93, "difficulty": "hard", "question": "If a,b,c are in AP, prove that 1/(√b+√c), 1/(√c+√a), 1/(√a+√b) are in AP? (True/False with reason)", "options": {"A": "True, always", "B": "False, not always", "C": "True for specific values", "D": "Cannot determine"}, "correct_answer": "B"},
    {"id": 94, "difficulty": "hard", "question": "If x,y,z are in AP, prove that (x+2y-z)(2y+z-x)(z+x-y)=4xyz. For x=1,y=2,z=3, verify.", "options": {"A": "LHS=24,RHS=24", "B": "LHS=20,RHS=24", "C": "LHS=24,RHS=20", "D": "LHS=20,RHS=20"}, "correct_answer": "A"},
    {"id": 95, "difficulty": "hard", "question": "If a,b,c are in AP, prove that (a-c)²/(b²-ac)=4. For a=2,b=4,c=6, verify.", "options": {"A": "16/4=4", "B": "16/8=2", "C": "16/12=4/3", "D": "16/16=1"}, "correct_answer": "A"},
    {"id": 96, "difficulty": "hard", "question": "If a_n = 3n-1, find S_n. Then prove S_n - S_{n-1} = a_n.", "options": {"A": "S_n=(3n²+n)/2, Yes", "B": "S_n=(3n²-n)/2, Yes", "C": "S_n=3n²/2, Yes", "D": "S_n=3n², Yes"}, "correct_answer": "B"},
    {"id": 97, "difficulty": "hard", "question": "If sum of n terms = 2n²+3n, find a_10.", "options": {"A": "43", "B": "45", "C": "47", "D": "49"}, "correct_answer": "A"},
    {"id": 98, "difficulty": "hard", "question": "If S_n = 5n²+3n, prove that sequence is AP. Find a and d.", "options": {"A": "a=8,d=10", "B": "a=3,d=10", "C": "a=8,d=5", "D": "a=3,d=5"}, "correct_answer": "A"},
    {"id": 99, "difficulty": "hard", "question": "If a,b,c are in AP, prove that a(1/b+1/c), b(1/c+1/a), c(1/a+1/b) are in AP. For a=1,b=2,c=3, check.", "options": {"A": "4/3,5/3,2 in AP", "B": "4/3,5/3,8/3 in AP", "C": "4/3,2,8/3 in AP", "D": "5/3,2,8/3 in AP"}, "correct_answer": "B"},
    {"id": 100, "difficulty": "hard", "question": "If S_m = S_n for m≠n, prove that S_{m+n} = 0. For AP with a=2,d=3, find m,n such that S_m=S_n.", "options": {"A": "m=4,n=6", "B": "m=5,n=7", "C": "m=6,n=8", "D": "m=7,n=9"}, "correct_answer": "B"}
  ]
}