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Mathematics, 20.08.2019 04:30 riosd920

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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How many numbers are less than 1000 that contain only the digits 5 or 6 or both 5 or 6? a digit may...
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