14.4 Permutation vs. Combination

Permutation vs. Combination

Lessons

Notes:
- permutation: nPr = number of arrangements of “r” items taken from a set of “n” distinct items (order matters!!) = n!(nr)!\frac{{n!}}{{\left( {n - r} \right)!}}

- combination: nCr = number of selections of “r” items taken from a set of “n” distinct items (order does NOT matter!!) = n!(nr)!r!\frac{{n!}}{{\left( {n - r} \right)!\;\;r!}}
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Permutation vs. Combination

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