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1. x4=81

A. $\frac{81}{4}$
B. $\frac{81}{4}$
C. $\frac{81}{4}$
D. $\frac{81}{4}$

Answer: Option D

Explanation:

x^{4} = 3^{4} \Rightarrow x = 3 এবং, y^{2} {=7}^{2} ⇒y=7 ∴ x + y = 3 + 7 = 10

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