1.

Prove that :(i) ""^(n)P_(r )=""^(n-1)P_(r+r)""^(n-1)P_(r-1)(ii)""^(n)P_(r )=n ""^(n-1)P_(r-1)(iii)""^(n)P_(r )=(n-r+1)""^(n)P_(r-1),for all natural numbers n and r for which the symbols are defined.

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ANSWER :`""^(N)P_(R )`


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