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30 January, 06:08

How many four digit numbers can we make from the numbers 5, 6, 7, 9 if you can repeat the digits and use the digit 5 at least once?

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  1. 30 January, 08:10
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    Multiply the number of choices for each position together. Three of the numbers can be repeated with the one (5) only being used once.

    (4 possible choices) * (3 possible choices) * (3 possible choices) * (3 possible choices) = 4 * 3 * 3 * 3 = 108
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