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GMAT Online Course | Number Properties Sample Question | Sequences & Series | Problem Solving Practice

A GMAT 650 Level Sequences & Series Question. We have to find the common ratio of the GP.

Question
If the ratio of the sum of the first 6 terms of a G.P. to the sum of the first 3 terms of the G.P. is 9, what is the common ratio of the G.P?

A. 3
B. 1/3
C. 2
D. 9
E. 1/9

Approach:
Step 1: Calculate the ratio of sum of first 6 terms to the first 3 terms of the GP.
Step 2: Compute the common ratio by equating the ratio of sum of first 6 terms and first 3 terms of the GP to 9.

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1 Comment

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  1. These tit bits are really helpful Bhaskar. Thanks a lot

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