Math

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How many seven-digit numbers less than 1,048,000 can be made using the digits 0,1,4,6,7,8, and 9? Make a list of possible ways to represent your seven-digit numbers.

  • Math -

    The constraints are:
    1. the number has to have 7 digits (i.e. the first digit cannot be zero)
    2. the resulting number cannot be more than 104800.

    Starting from the left-most digit, ask yourself which digits will fit the constraints.

    Continue this way for the remaining digits. If there is more than one choice, make a list of each possibility, and work on each separately.

  • Math -

    2x9x9x9x9x9x9

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