Q.

The ratio of sum of first three terms of a G.P to the sum of first six terms is 64:91 , the common ratio of G.P. is

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a

14

b

34

c

54

d

74

answer is B.

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Detailed Solution

Given S3S6=6491=ar3−1ar6−1⇒r3−1r3+1r3−1=6491⇒r3=2764∴r=34
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