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${(p^{- 1} + q^{- 1})}^{- 2}$ এর সরলমান নিচের কোনটি?

\frac{p + q}{p q}

\frac{p q}{{(p + q)}^{2}}

\frac{p q}{p + q}

\frac{p^{2} q^{2}}{{(p + q)}^{2}}

ANS : 4

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