calendar with 2 cubes

February 12, 2012

You are given 2 (regular, six sided) cubes and on each side of these cubes you are allowed to write any one single digit number. What numbers should each of these cubes have so that any day in the calendar (01,02, …, 31) can be represented using these  2 cubes?

Solution in comments.

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2 Responses to “calendar with 2 cubes”

  1. Ramesh Says:

    Cube 1: 0, 1, 2, 3, 4, 5
    Cube 2: 0, 1, 2, 6 or 9, 7, 8

    I found this problem in “The Colossal Book of Short Puzzles and Problems” by Martin Gardner (1.3)

    There is a US patent issued for the calendar cube.

  2. Vijay Says:

    For me, the highlight was the special relationship between two specific digits. That clue seems adequate for most who might get stuck.


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