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If 4 ^{x+ y} = 1 and 4 ^{x- y} . then the values of x and y respectively are-

- \frac{1}{2} a n d \frac{1}{2}

- \frac{1}{2} a n d - \frac{1}{2}

\frac{1}{2} a n d - \frac{1}{2}

\frac{1}{2} a n d \frac{1}{2}

ANS : 3

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