If n P 5-9 - n -1 P 4- then the value of n isA- 8B- 5C- 6D- 9

The correct option is D 9^n P_5/^n 1 P_4=9 ⇒n!/(n 5)!×(n 5)!/(n 1)!=9 ⇒ n=9 ...

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Combination

If n P 5=9 × ...

Question

If $^{n} P_{5} = 9 \times^{n - 1} P_{4}$ , then the value of n is

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