A = { 1, 2, 3, ...., 28}
证明: 如果从A中任意取10个数, 那么从这十个数中你可以找到一个子集, 这个子集中所有元素的积是完全平方数.
http://spellscroll.com/questionfull/246/
Thursday, October 23, 2008
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