afda permutation, combination, counting

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362880

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24

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What is the formula for permutations of n items taken r at a time?

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What is the formula for combinations of n items taken r at a time?

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What is the difference between permutations and combinations?

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Permutations consider the order of selection, while combinations do not.

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If a student body of 165 students wants to elect three representatives, is this a permutation, combination, or neither?

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Combination.

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How many unique ways can you flip a coin, roll a die, and spin a five-sectioned spinner?

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60.

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20.

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The factorial of n, which is the product of all positive integers up to n.

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