多选题If x and y are both positive even integers, which of the following expressions must be even? (Select all such expressions.)AxyB(x+1)yCx(y+1)
题目
多选题
If x and y are both positive even integers, which of the following expressions must be even? (Select all such expressions.)
A
xy
B
(x+1)y
C
x(y+1)