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Permutations and Combinations Compared

Order is important when picking r at a time from a group of n:  nPr = n!/ (n-r)!

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Probability Study Guide
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This study guide reviews the probability of simple events, non-simple events, complementary events, compound events, conditional events, independent events, and mutually exclusive events. It also looks at tree diagrams and counting, combination, and permutation.
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