Q. 20

Mark the correct A.

B.

C. 4

D. none of these

Answer :

Let,a be the first term and r be the common ratio. The


number of terms is 2n.


G.P. a, ar, ar2, …… (upto 2n terms)


Sum of all terms =


Odd terms G.P. a, ar2, ar4, …… (upto n terms)


Sum of odd terms G.P. =


Sum of all terms = 5×Sum of odd terms



5(1 – r) = (1 – r2)


r2 – 5r + 4 = 0


(r – 1)(r – 4) = 0


r = 1(not possible) and r = 4


So, common ratio of the G.P. = 4

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