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" 3.If "^(n)P(4):^(n+1)P(4)=3:4," find "...

" 3.If "^(n)P_(4):^(n+1)P_(4)=3:4," find "n

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If .^(n+1)P_(4):^(n-1)P_(3)=72:5 , find n.

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