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March 26, 2017

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How many 4-digit numbers can be formed using the numbers 5, 6, 7 and 8? How many of the 4-digit numbers are less than 7000?

  • math - ,

    Since there are 4 choices for each digit, there are 4^4 = 256 different numbers.
    Only half of them begin with 5 or 6

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