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• 12:46, 13 April 2023 Gispzjz talk contribs created page 组合数学 (Fall 2023)/Problem Set 2 (Created page with "Let <math>S=\{P_1,...,P_n\}</math> be a set of properties, and let <math>f_k</math> (respectively, <math>f_{\geq k}</math>) denote the number of objects in a finite set <math>U</math> that have '''exactly''' <math>k</math> (respectively, '''at least''' <math>k</math>) of the properties. Let <math>A_i</math> denote the set of objects satisfies <math>P_i</math> in <math>U</math>, for any <math>I\subseteq\{1,...,n\}</math>, we denote <math>A_I=\bigcap_{i\in I}A_i</math> wi...")