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What should come in place of the question mark (?) in the following questions?
$$\sqrt{?}-11=\sqrt{1521}$$
2500
$$28^{2}$$
$$\sqrt{28}$$
50
None of these
$$\sqrt{1521}$$ = 39 Let unknown be x. $$\sqrt{x}$$ = 39+11 = 50 x = 50^2 = 2500 Hence, the correct answer is option A.
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