The sum of n-terms of an AP .is `56` and the common difference is `2`. If first term is an integer and `n>1` then n can have value.
(A) 7
(B) 8
(C) 24
(D) 28

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The sum of the first n terms (n>1) of an AP is 153 and the common difference is 2. If the first term is an integer,then what is the number of possible values of n.

If the sum of n terms of an A.P.be 3n^(2)-n and its common difference is 6, then its first term is 2 b.3 c.1 d.4

Sum of first n terms of an A.P. whose last term is l and common difference is d, is