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rjkz [21]
3 years ago
10

If (n+1)!=90×(n-1)!,find n.​

Mathematics
1 answer:
Helen [10]3 years ago
4 0

 

\displaystyle\bf\\(n+1)!=90\times (n-1)!\\\\(n-1)!\times n\times(n+1)=90\times (n-1)!~~~\Big|~:(n-1)!\\\\n(n+1)=90\\\\n(n+1)=9\times10\\\\n(n+1)=9(9+1)\\\\\implies~~\boxed{\bf n=9}

 

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