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iChase (Victor) 于 (Mon Oct 8 19:44:20 2007) 提到:
100 cards are numbered 1 to 100 (each card different) and placed in 3 boxes
(at least one card in each box). How many ways can this be done so that if
two boxes are selected and a card is taken from each, then the knowledge of
their sum alone is always sufficient to identify the third box?
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robustzgy (浪迹天涯) 于 (Mon Oct 8 20:24:09 2007) 提到:
unclear
1. How to ch
