Sum of values of \( x \) and \( y \) satisfying the equation \( 3^{...

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Sum of values of \( x \) and \( y \) satisfying the equation \( 3^{x}-4^{y}=77 ; 3^{x / 2}-2^{y}=7 \) is:
P
(a) 2
(b) 3
W.
(c) 4
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