if the pth term of an A.P. is 1/q and the qth term is 1/p,show that the sum of pq terms is 1/2(pq+1).

Dear Student!

Let a and d be the first term and common difference of A.P. respectively.

Solving (1) and 2, we get

Sum of  pq terms of the A.P. = Spq  

Thus, the sum of pq terms of the given A.P. is .


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thanx a lot sir..

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