If y is an integer, which of the following must also be an integer?
I. x/y
II. y/x
III. xy	Choices
A) I alone	B) II alone	C) III alone	D) I and III	E) None of the above
Lets take X = 5 and Y = 3   Then XY = 15 which is an integer.   But X/Y = 5/3 --&gt; Not an integer.   Y/X = 3/5 --&gt; Not an integer.   Hence III alone.
<result>C</result>
If y is an integer, which of the following must also be an integer?
I. x/y
II. y/x
III. xy