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If the sum of n terms of an A.P. is give...

If the sum of n terms of an A.P. is given by `S_(n) =(3n^(2)+2n)` , find its `n^(th)` term.

A

`6n+1`

B

`6n-1`

C

`4n-2`

D

`4n-1`

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