Puzzle - 15 Game

Rules:

Put the numbers in various predetermined orders. For example, put the numbers 1, 2, 3, and 4 in the first row, 5, 6, 7, and 8 in the second row, 9, 10, 11, and 12 in the third row, and 13, 14, and 15 in the left-most squares in the bottom row. There are other arrangments that are harder, and in fact some arrangements are mathematically impossible as we shall prove in a problem.

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Last modified on Tuesday, January 12, 1999