find the sum of n terms of an ap is 3,5,7.....
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a=3,d=2
Sn=n/2(2×3+(n-1)×2)
n/2(6+2n-2)
n(2+n)
2n+n^2
Sn=n/2(2×3+(n-1)×2)
n/2(6+2n-2)
n(2+n)
2n+n^2
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