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OpenStudy (anonymous):
Evaluate 7!/5!2! a)1 b)21 c)42
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OpenStudy (lgbasallote):
hmm so what's the problem here?
OpenStudy (anonymous):
Write out what 7!, 5!, and 2! actually mean, then do a bunch of cancelling on the top and bottom. It turns a problem that doesn't look like it could possibly be done in your head into a pretty easy one.
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