If the sum of p terms of an A.P. is equal to the sum of q terms then show that the sum of its p+q terms is zero.

Asked by  | 26th Jul, 2011, 02:42: PM

Expert Answer:

=>2a(p-q)+{(p2 -q2 )-(p-q)}d=0
=>2a+(p+q-1)d=0         [since p is not equal to q]
=> Sm+n=(m+n)/2*0=0

Answered by  | 26th Jul, 2011, 10:15: AM

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