1. A={1,2,3,4} B={1,2,3,4,5,6}
(1)可造出 A-->B 之單調遞增函數有幾個?
(2)可造出 A-->B 之絕對遞減數列有幾個?
Ans:(1) H(6,4) (2) C(6,4)
2.函數f之定義域A={1,2,3,4,5,6},f之值域是A之子集,若f(x)不能有3個以上(不包括3個)
之像源這種f有幾個?
Ans: 44220
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