Answers

2014-04-26T07:43:52+05:30
Let a be the first term of G.P and r be the common ratio
sum of first 20 terms=244(sum of first 10 terms)
 \frac{a(r^{20}-1)}{r-1}=244\frac{a(r^{10}-1)}{r-1}
 \frac{r^{20}-1}{r^{10}-1}=244
take r¹⁰ as b
 \frac{b^2-1}{b-1}=244 \\ b+1=244 \\ b=243 \\ r^{10}=243=3^5 \\ r= \sqrt{3}     
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