If Pn- 5 - 20 P n - 3- then n -A- 2B- 4C- 6D- 8

The correct option is D 8P(n,5)=20P(n,3) ⇒∠ n/∠ n 5 = 20∠ n/∠ n 3 ⇒ (n 3) (n 4)=5 × 4 ⇒ n 3 =5 ⇒ n =8 ...

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nCr Definitions and Properties

If Pn, 5 = 20...

Question

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

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