If x and y are integer, which of the following must also be an integer?
I. xy
II. y/x
III. x
Pick one: A) I alone B) II alone C) III alone D) I and III E) None of the above
Let's take X = 4and Y = 3   XY which is an integer   Y/X = 3/4 Not an integer.   X alone is 4 which is an integer.   Hence I and III.
<result>D</result>
If x and y are integer, which of the following must also be an integer?
I. xy
II. y/x
III. x