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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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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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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3
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If log 2, log (2^{x} 1) and log (2^{x} + 3) are in A.P, then x is equal to ___
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The common difference of the A.P. \(\frac{1}{{2b}} \frac{{1  6b}}{{2b}} \frac{{1  12b}}{{2b}}\) . . . . . is
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The number of terms of the A.P. 3, 7, 11, 15, ....... to be taken so that the sum is 406 is
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If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 term is
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What is the sum of the first 13 terms of an arithmetic progression if the first term is 10 and last term is 26?
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8
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If three numbers be in G.P., then their logarithms will be in
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9
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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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10
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How many terms are there in 20, 25, 30 . . . . . . 140?
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