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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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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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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The common difference of the A.P. \(\frac{1}{{2b}} \frac{{1  6b}}{{2b}} \frac{{1  12b}}{{2b}}\) . . . . . is
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If 18, a, b  3 are in A.P. then a + b =
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The sum of first n odd natural numbers in
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A bacteria gives birth to two new bacteria in each second and the life span of each bacteria is 5 seconds. The process of the reproduction is continuous until the death of the bacteria. initially there is one newly born bacteria at time t = 0, the find the total number of live bacteria just after 10 seconds :
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If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :
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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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Which term of the A.P. 92, 88, 84, 80, ...... is 0?
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If a + 1, 2a + 1, 4a  1 are in A.P., then the value of a is:
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