Combinatorics (Fall 2010)/Problem set 2: Difference between revisions
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== Problem 1 == | == Problem 1 == | ||
提示：用鸽笼原理。 | 提示：用鸽笼原理。 | ||
Revision as of 09:47, 14 October 2010
Problem 1
提示：用鸽笼原理。