If the nth term of an A.P. is 2n + 1, then the sum of first n terms of the A.P. is
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The 3rd and 7th term of an arithmetic progression are -9 and 11 respectively. What is the 15th term?
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If four numbers in A.P. are such that their sum is 50 and the greatest number is 4 times the least, then the numbers are
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3
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Two A.P.’s have the same common difference. The first term of one of these is 8 and that of the other is 3. The difference between their 30th terms is
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4
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What is the sum of the first 11 terms of an arithmetic progression if the 3rd term is -1 and the 8th term is 19?
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5
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If Sn denote the sum of the first n terms of an A.P. If S2n = 3Sn , then S3n : Sn is equal to
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6
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What is the sum of the following series? -64, -66, -68, ......, -100
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7
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What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?
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8
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Which term of the A.P. 92, 88, 84, 80, ...... is 0?
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9
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The 4th and 7th term of an arithmetic progression are 11 and -4 respectively. What is the 15th term?
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10
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If k, 2k – 1 and 2k + 1 are three consecutive terms of an AP, the value of k is
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