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Let an denote the n-th term of an A.P. ...

Let `a_n` denote the n-th term of an A.P. and `p and q` be two positive integers with `p lt q`.If `a_(p+1)+a_(p+2)+a_(p+3)+........+a_q=0` find the sum of first `(p+q)` terms of the A.P.

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