If x and y are positive integers and y ≠ 1, then xy(y −1) is	Choices
A) Always even	B) Always odd	C) Odd only when x is odd	D) Even only when y is even	E) Odd only when xy is odd
Expression is xy(y-1). We can ignore x and only work with y.   If y = even -&gt; entire expression is even since anything multiplied by even is even   If y = odd, y-1 -&gt; even -&gt; entire expression is even since anything multiplied by even is even   Hence, entire expression will always be even.   Always evennswer (Always even).
<result>A</result>
If x and y are positive integers and y ≠ 1, then xy(y −1) is