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Question

Find the sum to n terms of a G.P., 1,a,a2,a3.... (if a1)

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Solution

Let A be the first term and R be the common ratio.
first term =A=1
and common ratio =R=a1=a
We know, the sum of n terms of G.P. is
Sn=A(1Rn)1R
Sn=1(1(a)n)1(a)
Sn=1(a)n1+a

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