問題詳情

12. (3%) Let A be a set with n clements. Which of the followings is the number of binary relations on A whichare symmetric and antisymmetric, and not irreflexive?
(A)2n
(B) 2n -1
(C)


(D)

參考答案

答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增