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If the letters a, b, c, d, e, and f are to be used in a five-letter code, how many different codes are possible if repetitions are not permitted?
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If the letters a, b, c, d, e, and f are to be used in a five-letter code, how many different codes are possible if repetitions are not permitted?

User Lari
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1 Answer

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It's (6•5•4•3•2) which is 720 of them.
User Adrian Clark
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