设集合A={1,2,3},集合B={2,4,6},给定函数f={(1,2),(2,4),(3,6)},则逆函数f-1

设集合A={1,2,3},集合B={2,4,6},给定函数f={(1,2),(2,4),(3,6)},则逆函数f-1
【正确答案】：{＜2,1＞,＜4,2＞,＜6,3＞}