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Geometric Progression

Expert replies
Source: — Problem Solving |

by aspiregmat » Thu Aug 06, 2009 10:16 pm
Sum of GP= a * (r^n - 1) / (r - 1)

here the ratio of sum of 6 terms by sum of 3 terms

=> (r^6 - 1) / (r^3 -1 ) = 9
=> r^6 - 9r^3 + 8 = 0
=> (r^3 - 1)(r^3 - 8) = 0

So IMO Ans = 2 i.e. C
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