Double Factorial Fun

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I hope you guys like this one.
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So 9!! and (9!)! mean different things. Man isn't math just incredibly fun and not infuriating at all and super great and totally awesome?

blengenold
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Since when does double fscotural mean only odd numbers? I've never see thant..shouldn't 9 factorial factorial mean the factorial of 9 factorial..in other words it should be 362880!...so this interpretation would be wrong..or it's an alternate interpretation I've never seen.

leif
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pls video of subtracting mixed numbers

rolandoespinoza