Unformatted text preview: 6 ! 1 1 * 2 * 3 )! 2 3 ( ! 3 = = − B P F B P F B P F B P F B P F To calculate the number of permutations with classes: There are three blocks to be ranged and two (No.#2 and No#3) of them are the same. How many orders can the three blacks be arranged? n=3, r=3, n 1 =1, n 2 =2 2 1 3 same 1st arrangement 3 ! 2 ! 1 ! 1 * 2 * 3 ! 2 ! 1 )! 3 3 ( ! 3 ! ! )! ( ! 2 1 = = − = − n n r n n 3 1 2 2 1 3 3 1 2 2 1 3 3 1 2 } } } same, 1st arrangement 2 nd arrangement 3 rd arrangement...
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 Fall '11
 Glyn
 Math, Permutations, different combinations, pilot plant, distinguishable items

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