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Set P consists of all the positive even integers less than 14,and set Q consists of all the positive multiples of 3 less than 21.Set R consists of all members that are either in set P or set Q.How many members of set R are even?(A) 6(B) 7(C) 9(D) 10(
题目详情
Set P consists of all the positive even integers less than 14,and set Q consists of all the positive multiples of 3 less than 21.Set R consists of all members that are either in set P or set Q.How many members of set R are even?
(A) 6
(B) 7
(C) 9
(D) 10
(E) 12
我怎么觉得有18个 选哪个
(A) 6
(B) 7
(C) 9
(D) 10
(E) 12
我怎么觉得有18个 选哪个
▼优质解答
答案和解析
P={2,4,6,8,10,12}
Q={3,6,9,12,15,18}
R={2,3,4,6,8,9,10,12,15,18}
其中偶数个数是7,故选B
Q={3,6,9,12,15,18}
R={2,3,4,6,8,9,10,12,15,18}
其中偶数个数是7,故选B
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