Problem Solving
试题详情
题目：
If x and y are different prime numbers, each greater than 2, which of the following must betrue?
I
II x - y is an even integer.
III
is not an integer.
I
II x - y is an even integer.
III
is not an integer.选项:
A、II onlyI and II only
B、I and III only
C、II and III only
D、I,IIandIII
答案:
E
