Answered

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Express the given product or quotient as a factorial expression. Assume that n > r > 0.

1. (n+1)n!

2. (n+8)!/n+8

3. 100 x 99 x 98

4. (n-1)(n-2)(n-3)

Sagot :

olemakpadu
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.
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