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Sagot :
1.) (n+1)n! = (n+1)!
2.) (n+8)!/n+8 = (n+8)!/(n+8)
= (n+8)*(n+8-1)! / (n+8) = ((n+8)*(n+7)!) / (n+8)
Cancel out the (n+8)
= (n +7)!
3.) 100 x 99 x 98 = (100 x 99 x 98 x 97!) / (97!) = (100!) / (97!).
4. (n-1)(n-2)(n-3) = ((n-1)(n-2)(n-3)(n-4)!) /(n-4)!
= (n-1)! / (n-4)!.
Cheers. That's it.
2.) (n+8)!/n+8 = (n+8)!/(n+8)
= (n+8)*(n+8-1)! / (n+8) = ((n+8)*(n+7)!) / (n+8)
Cancel out the (n+8)
= (n +7)!
3.) 100 x 99 x 98 = (100 x 99 x 98 x 97!) / (97!) = (100!) / (97!).
4. (n-1)(n-2)(n-3) = ((n-1)(n-2)(n-3)(n-4)!) /(n-4)!
= (n-1)! / (n-4)!.
Cheers. That's it.
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