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AFCAT | Elementary Mathematics | Sequence and Series

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Question 1

How many terms of the A.P. – 6,  , – 5, ... are needed to give the sum –25?

Question 2

If nth term of the G.P., 2,8,32, ... up to n terms is 131072 . Then n is

Question 3

If a, b and c are the A .M., G. M. and H.M. of two number, then

Question 4

Find the sum upto 100 terms of the series whose nth term is n (n+3).

Question 5

If the sum of n terms of an A.P. is , where P and Q are constants, then find the common difference.
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Apr 26CDS & Defence