Browsing the r/math subreddit I see
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Which would be n/(n-1)!. Isn't it?!
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It's the same thing just with an n factored out.
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The demonstration of this is very easy (using definition of factorial).
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the expression of the left is n/(n-1)!=n*(n/n!)=n^2/n!
Thanks. Twitter will use this to make your timeline better. UndoUndo
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Is it worth memorizing? Is it used anywhere?
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It's kind of trivial, so if you ever need to use it, it should be obvious. Don't memorize it.
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