If n 4- n P 5-1- 2- then n -A- 4B- 5C- 6D- 7

The correct option is C 6n!/(n 4)!×(n 5)!/n! = 1/2⇒ n 4 ⇒ n=6 ...

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Proof by mathematical induction

If n 4: n P 5...

Question

If $^{n} P_{4} :^{n} P_{5} = 1 : 2$ , then n =

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