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# What is this Operation?

12/2/05

Describe what the operation * is doing exactly. Because A*B=B*A, only half of the table is shown.

 * 0 1 2 3 4 5 6 7 8 9 0 0 0 8 8 8 8 8 0 8 8 1 1 u 3 4 9 8 7 8 9 2 2 u 8 8 8 u 8 8 3 3 9 9 8 3 8 9 4 4 9 8 u 8 9 5 5 6 9 8 9 6 6 8 8 8 7 7 8 9 8 8 8 9 9
(u means undefined)

Hint: think of a digital clock

Answer: As of 6/20/09 no one has the answer, so I'll spill the beans. Take a standard digital clock, and cross your eyes until number A overlaps number B. The number A*B is what the overlap of A and B produces.

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