Evaluate each factorial expression(adsbygoogle = window.adsbygoogle || []).push({});

A) (n+2)!/n!

My book doesn't really show how to come up with a solution. After looking in the back for the answer it showed (n+2)(n+1), which works if you plug in random values for x. "After" seeing the answer I reasoned maybe it could be broken down as (n+1)(n+2)n!/n!, but not really understanding why... like how am I factoring out the n! & ending up with that?

Here is another one I'm struggling with n!/(n-1)!. Here again, the book shows the answer to be n, which works, but can't quiet figure out how to get started. I thought maybe it'd be n!/(n-1)n! but that doesn't give me n as an answer.

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# Homework Help: Evaluating Fractions with fractorials

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