If a + 1, 2a + 1, 4a  1 are in A.P., then the value of a is:
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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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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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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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If the fifth term of a GP is 81 and first term is 16, what will be the 4th term of the GP?
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5
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If three numbers be in G.P., then their logarithms will be in
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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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7
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How many terms are there in the GP 5, 20, 80, 320........... 20480?
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8
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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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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 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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