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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The 2^{nd} and 8^{th} term of an arithmetic progression are 17 and 1 respectively. What is the 14^{th} term?
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2
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If the 7^{th} term of a H.P. is 1/10 and the 12^{th} term is 1/25, then the 20^{th} term is
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3
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If the sum of n terms of an A.P. is 3n2 + 5n then which of its terms is 164 ?
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4
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Consider an infinite G.P. with first term a and common ratio r, its sum is 4 and the second term is 3/4, then
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5
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(1) + (1 + 1) + (1 + 1 + 1) + ....... + (1 + 1 + 1 + ...... n  1 times) = ......
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6
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The sum of the first four terms of an A.P. is 56. The sum of the last four terms is 112. If its first term is 11, the number of terms is
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7
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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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8
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15th term of A.P., x  7, x  2, x + 3, ........ is
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9
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What is the sum of the first 17 terms of an arithmetic progression if the first term is 20 and last term is 28?
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10
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A boy agrees to work at the rate of one rupee on the first day, two rupees on the second day, and four rupees on third day and so on. How much will the boy get if he started working on the 1st of February and finishes on the 20th of February?
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