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Sum of n terms of G.P.

## Equation : Sum of n terms of G.P. | Sn = a(1-r^{n})/(1 – r) if r<1. Sn=a(r^{n}-1)/(r-1) if r>1

## The second and fourth term of G.P. are 18 and 72 respectively. Find the sum of its first 10 terms.

## Obtain the sum of the following series up to n terms : 1+11+111+1111+11111+… up to n terms

## Find the sum of the series : 0.5 + 0.55 + 0.555 + .. up to n terms

## Obtain the sum of the series up to n terms : 1 + 11 + 101 + 1001 +.. up to n terms

## Find the sum of terms of the series 11 + 103 + 1005 +…

## Three numbers are in A.P. Their sum is 24 . If the first is decreased by one, the second is decreased by two and the third is not changed then they form a G.P. Find the three numbers in A.P.

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