MATH 2P82 MATHEMATICAL STATISTICS (Lecture Notes)
Selecting rout of nobjects (without duplication), counting all possible arrange-ments: n×(n−1) ×(n−2)×....×(n−r+1)= n! (n−r)! def.= Pn r (number of permutations). Forget their final arrangement: Pn r r! = n! (n−r)!r! def.= Cn r (number of combinations). This will also be called the binomial coeffi-cient.
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