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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

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detailed solution

Correct option is B

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


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