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Formula for sum of 'n' terms in an AP = ...

Formula for sum of 'n' terms in an AP = …………..

A

`Sum_n=(n(n+l))/2`

B

`Sum_(n^2)=(n^2(n+l)(n+2))/6`

C

`S_n=n/2[2a+(n-1)d] or S_n=n/2[a+l]`

D

`a_n = a+(n-1)d`

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