If the function \( f: N \rightarrow \mathrm{N} \) is defined by \( ...

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If the function \( f: N \rightarrow \mathrm{N} \) is defined by \( f(x)=\sqrt{x} \), then
\( \mathrm{P} \) \( \frac{f(25)}{f(16)+f(1)} \) is equal to

W)
(a) \( \frac{5}{6} \)
(b) \( \frac{5}{7} \)
(c) \( \frac{5}{3} \)
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