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Unformatted text preview: m and the other gives n . n r = n nr . 2 n n = n X r =0 n r 2 . March 8 Permutations and combinations, Page 4 17.4 Division rule If f : A B is a kto1 function, and A and B are nite sets, then  A  = k  B  . Another chess problem How many arrangements of the letters BOOK? March 8 Permutations and combinations, Page 5 17.5 Poker hands A hand is a 5combination. How many hands are: FourofaKind: include a set of cards of the same value. FullHouse: three cards of one value and two cards of another value. TwoPairs: two cards of one value, two of another value, and one of a third value. EverySuit: contains at least one card from every suit. March 8 Permutations and combinations, Page 6...
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 Winter '07
 YaoyunShi

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