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1. $\frac{1}{2 x} + \frac{1}{2 y} = 1$

Answer: Option B

Explanation:

\frac{1}{2 x} + \frac{1}{2 y} = 1 > \frac{1}{2} (\frac{1}{x} + \frac{1}{y}) = 1 > \frac{1}{x} + \frac{1}{y} = 2 আবার, \frac{1}{x^{2}} + \frac{1}{y^{2}} = 12 > (\frac{1}{x} + \frac{1}{y}) (\frac{1}{x} - \frac{1}{y}) = 12 > 2 (\frac{1}{x} - \frac{1}{y}) = 12 > \frac{1}{x} - \frac{1}{y} = 6

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