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    OlympiadEasyCombinatorics5–6

    Clever Counting

    Contagem Inteligente

    How many 3-digit numbers can be formed using the digits \{1, 2, 3, 4, 5\} if repetition is allowed?

    The digits may repeat, so the choice made at one position does not restrict any other.

    Solution

    Step 1 of 4

    1. 1.Hundreds digit: 5 choices