MDM4U – Factorials, Permutations, and Practice 2017-09-11


We learned about Factorial Notation and about Permutations today:

Factorial: n!=n\times(n-1)\times\ldots\times2\times1

Number of arrangements of r distinct objects from a group of n distinct objects: _nP_r = P(n,r) = \frac{n!}{(n-r)!}

Number of permutations of n distinct objects: _nP_n = P(n,n) = n!

Homework page 239 #9-14. We did some of this in class. Remember that #12 is the most complex question, so don’t spend more than 30 minutes on this tonight (unless you want to).

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