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Question

$\frac{1}{x} + \frac{1}{y} = 3$ এবং $\frac{1}{x^{2}} - \frac{1}{y^{2}} = 9$ হলে $\frac{1}{x} - \frac{1}{y} =$ কত?

1

$\frac{1}{3}$

3

9

ANS : 3

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