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+1 vote
14.0k views
in Mathematics by (54.1k points)

In a G.P. of even number of terms, the sum of all terms is 5 times the sum of the odd terms. The common ratio of the G.P. is

(A) -4/5

(B) 1/5

(C) 4 

(D) none the these

1 Answer

+1 vote
by (88.2k points)
selected by
 
Best answer

(C) is the correct answer

Let us consider a G.P. a, ar, ar2, ... with 2n terms. 

We have

(Since common ratio of odd terms will be r2 and number of terms will be n)

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