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Evaluate: $\sqrt{248 + \sqrt{51 + \sqrt{169}}}$

A. 32

B. 23

C. 15

D. 16

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Correct Answer : D.

Given expression =

\sqrt{248 + \sqrt{51 + 169}} = \sqrt{248 +} \sqrt{51 + 13} = \sqrt{248 + \sqrt{64}} = \sqrt{248 + 8} = \sqrt{256} = 16

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