Solution to Prove that ( ) ( ) 1, 1 , nPnnPnn  − − = . - Sikademy
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Prove that ( ) ( ) 1, 1 , nPnnPnn  − − = .

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Prove that ^nP_{n}=^nP_{n-1}


Proof:

^nP_{n}=n!


^nP_{n-1}=\frac{n!}{[n-(n-1)]!}=\frac{n!}{1}=n!


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