If n P 4-30 n C 5- then n -A- 7B- 6C- 8D- 9

The correct option is C 8 ^nP_4/^nC_5 = 30 ⇒n!/(n 4)!×5!.(n 5)!/n! = 30 ⇒ (n 4) = 4⇒ n = 8 ...

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nCr Definitions and Properties

If n P 4=30 n...

Question

If $^{n} P_{4}$ = $30^{n} C_{5}$ , then n =

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