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Sum of n terms of an AP...

Sum of n terms of an AP

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If the sum of n terms of an A.P is cn (n-1)where c ne 0 then the sum of the squares of these terms is

If the sum of n terms of an A.P is 2n+3n^(2) , find the r^(th) term

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.

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