If xy is an integer, which of the following must also be an integer?
I. x/y
II. x
III. y/x  Choose the correct choice:
A) I alone
B) II alone
C) I and II
D) I and III
E) None of the above
Lets take X = 3 and Y = 7   Then XY = 21 which is an integer.   But X/Y = 3/7 --&gt; Not an integer.   Y/X = 7/3 --&gt; Not an integer.   X alone is 3. which is an integer.   Hence II alone.
<result>B</result>
If xy is an integer, which of the following must also be an integer?
I. x/y
II. x
III. y/x