问题
选择题
已知集合U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},则CUA和CUB公共元素的个数为( )
A.2
B.3
C.5
D.6
答案
∵U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},
∴CUA={1,3,6},CUB={1,2,6,7},
∴(CUA)∩(CUB)={1,6}.
故选A.
已知集合U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},则CUA和CUB公共元素的个数为( )
A.2
B.3
C.5
D.6
∵U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},
∴CUA={1,3,6},CUB={1,2,6,7},
∴(CUA)∩(CUB)={1,6}.
故选A.