Find the sum of first n terms QUOTE ⬚2 + ⬚8 + ⬚18 + ⬚32+………….n terms
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sun of first n. terms
Sn=n/2(2a+(n-1)d
here the given problem is infinte set
when only a finite is being solve the sum of n terms
so the first terms sum
Sn=4/2(2×2(4-1)d)
here the problem is not in ap
then how can find sum of n terms
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