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How many different four-digit number combinations are possible from the numbers 0-9?

  • math -

    number of different 4 digit number
    = 9x10x10x10 = 9000

    (we cannot start with a zero, thus only 9 choices for the lead number)

  • math -

    In my answer, I assumed that you can repeat a number

    If each can be used only once, then
    number of ways = 9x9x8x7 or 4536

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