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11 December, 07:37

How many numbers are less than 1000 that contain only the digits 5 or 6 or both 5 or 6? A digit may be used more than once.

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  1. 11 December, 10:04
    0
    5,6

    55,56

    65,66

    555,556,565,566

    655,656.665.666

    Looks like there are 14 numbers that use only the digits 5 or 6 or both 5 or 6 that are under 1000.
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