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March 25, 2017

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How many numbers greater than 300 000 are there using only the digits 1, 1, 1, 2, 2, 3?

  • Gr.12 Data Management - ,

    clearly the first digit must be the 3, so there are only the other 5 digits to arrange.
    we have 3 alike of one kind and 2 alike of another,
    so the number of ways = 1(5!)/(3!2!) = 10

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