題組內容
2.LetX=[x1,x2 , 
) and Y= (y1, y2, .. , 
] with|X| =m and |Y| = n.
(a) How many functions f:X→ Ysatisfy f(x1)=
?
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2.LetX=[x1,x2 , ) and Y= (y1, y2, .. , ] with|X| =m and |Y| = n.
(a) How many functions f:X→ Ysatisfy f(x1)=?