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Question

Find the sum to n terms of G.P., x3,x5,x7... (if x±1)

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Solution

Given, x3,x5,x7.... are in G.P.
Here, first term =a=x3 and common ratio =r=x5x3=x2
We know, the sum of n terms of G.P. is
Sn=a(1rn)1r
Sn=x3[1(x2)n]1x2
Sn=x3(1x2n)1x2

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