If P(n, 5) = 20P (n, 3), then n =

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Solution

The correct option is D 8
$P (n, 5) = 20 P (n, 3) \Rightarrow \frac{∠ n}{∠ n - 5} = \frac{20 ∠ n}{∠ n - 3}$ $\Rightarrow (n - 3) (n - 4) = 5 \times 4$ $\Rightarrow n - 3 = 5 \Rightarrow n = 8$

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