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Q.

A G.P. consists of an even number of terms. If the sum of all the terms is five times the sum of those terms occuping the odd places, then common ratio is

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a

2

b

3

c

4

d

5

answer is C.

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Detailed Solution

no of terms is 2n

S2n=5a1+a3+a5....nterms ar2n-1r-1=5a+ar2+ar4.....nterms                    =5ar2n-1r2-1 1=5r+1  ⇒  r=4

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