5.Prove or disprove that any subset of size six from the set S= {1, 2, 3,..., 9} must contain two el

問題詳情

5.Prove or disprove that any subset of size six from the set S= {1, 2, 3,..., 9} must contain two elements whose sum is 10. (20%)

答案：B
難度：適中0.5
統計：A(2),B(16),C(12),D(2),E(0)