问题
单项选择题
If X and Y are sets of integers, X△Y denotes the set of integers that belong to set X or set Y, but not both. If X consists of 10 integers, Y consists of 18 integers，and 6 of the integers are in both X and Y, then X△Y consists of how many integers ？（）
A．6
B．16
C．22
D．30
E．174
答案
参考答案：B
解析：
根据题意可知X△Y中的整数数目为：
(10-6)+(18-6)=16。