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In an A.P., if p^(th) term is 1/q and q^...

In an A.P., if `p^(th)` term is `1/q` and `q^(th)` term is `1/p`, prove that the sum of first pq terms is `1/2(pq+1)`, where `p ne q`.

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MODERN PUBLICATION-SEQUENCES AND SERIES-EXERCISE
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