(1) If A={1,2,3,...,10}, the number of functions f:A->A satisfy
f^(1)({1,2,3})=empty set,f^(1)({4,5})={1,3,7}, and f^(1)({8,10})={8,10} is 7776.
101成大单选题2.(A): f^(1)是什么意思? 7776怎么求得?
(2) Let A={1,2,3,4,5} and B={u,v,w,x,y}. Determine the number of one-to-one
functions f:A->B where f(1)≠v, w,f(2)≠u, w,f(3)≠x, y and f(4)≠v,x,y
101成大计算题(2): 我用tree列举应该是14种,有更好的方法?