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    Daily ChallengeHardCombinatorics

    How many 4-letter words can be formed from ABCDE with no repetition?

    Quantas palavras de 4 letras podem ser formadas com ABCDE sem repetição?

    Answer options

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    Solution

    P(5,4)=5!(5−4)!=5×4×3×2=120P(5,4) = \frac{5!}{(5-4)!} = 5 \times 4 \times 3 \times 2 = 120