问题:
设集合P={3,4,5},Q={4,5,6,7},定义P※Q={(a,b)|a∈P,b∈Q},则P※Q中元素的个数为( )
A.3
B.4
C.7
D.12
设集合P={3,4,5},Q={4,5,6,7},定义P※Q={(a,b)|a∈P,b∈Q},则P※Q中元素的个数为( )
A.3 | B.4 | C.7 | D.12 |
参考答案: