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Prove that (n !+1) is not divisible by ...

Prove that `(n !+1)` is not divisible by any natural number between `2` and `n`

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  5. If (n !)/(2!(n-2)!) and (n !)/(4!(n-4)!) are in the ratio 2:1 , find t...

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  8. Prove that: n(n-1)(n-2)....(n-r+1)=(n !)/((n-r)!)

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