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PermutationsOne important application of the Multiplication Principle of Counting is to count thenumber of ways that a set of n objects (called an n-set) can be arranged in order. Eachsuch ordering is called a permutation of the set. Example 1 showed that there are3! = 6 permutations of a 3-set. In fact, if you understood the tree diagram, you canprobably guess how many permutations there are of an n-set.
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