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Sum to N Terms of an A.P....

Sum to N Terms of an A.P.

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Sum of n Terms of an A.P. | Examples

If sum of n terms of an A.P. is 4n^(2) +7n , find the 15^(th) term.

The sum of n terms of an A.P. is n^(2) + 3n . Find its 20th term.

If sum of n terms of an A.P. is n^(2)+13 , find its 13^(th) term.

Find the sum of n terms of an A.P. whose nth term is (2n+1).

The sum of n terms of an A.P. is 3n^(2)+5 . The number of term which equals 159, is