If the ${p^{th}}$ term of an $A.P.$ be $\frac{1}{q}$ and ${q^{th}}$ term be $\frac{1}{p}$, then the sum of its $p{q^{th}}$ terms will be

  • A

    $\frac{{pq - 1}}{2}$

  • B

    $\frac{{1 - pq}}{2}$

  • C

    $\frac{{pq + 1}}{2}$

  • D

    $ - \frac{{pq + 1}}{2}$

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