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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If the sum of n terms of an A.P. be 3n2 + n and its common difference is 6, then its first term is
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The 2nd and 6th term of an arithmetic progression are 8 and 20 respectively. What is the 20th term?
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The 2^{nd} and 6^{th} term of an arithmetic progression are 8 and 20 respectively. What is the 20^{th} term?
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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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The 3^{rd} and 7^{th} term of an arithmetic progression are 9 and 11 respectively. What is the 15^{th} term?
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What is the sum of all positive integers up to 1000, which are divisible by 5 and are not divisible by 2?
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Find the 15th term of the sequence 20, 15, 10 . . . . .
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If S1 is the sum of an arithmetic progression of ‘n’ odd number of terms and S2 is the sum of the terms of the series in odd places, then \(\frac{{{S_1}}}{{{S_2}}}\)
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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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If three numbers be in G.P., then their logarithms will be in
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