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Q.

If $\log_{2} (4 + \log_{3} (x)) = 3$ , then sum of digits of x is__

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a

3

b

6

c

9

d

18

answer is C.

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Detailed Solution

$4 + \log_{3} x = 2^{3}$

$\begin{array}{l} \log_{3} x = 4 \\ x = 81 \\ sum of digit of x is 9 \end{array}$

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