# Counting, permutations, and combinations

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Counting principle and factorialPermutationsCombinationsCombinatorics and probabilityUnit testPractice

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Probability with permutations and combinations

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**Counting, permutations, and combinations**with these 10 questions.About this unit

This unit covers methods for counting how many possible outcomes there are in various situations. We'll learn about factorial, permutations, and combinations. We'll also look at how to use these ideas to find probabilities.