Find n ,if(n+1)!=12xx(n-1)dot...

Find `n ,if(n+1)!=12xx(n-1)dot`

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`(n+1)!=12xx(n-1)!`
or `(n+1)xx n xx (n-1)!=12xx(n-1)!`
or n(b+1)=12
or `n^(2)+n-12=0`
or (n+4)(n-3)=0
or n=3

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