If m and n are positive integers and n ≠ 1, then mn(n −1) is	Choose the correct choice from the following choices:  A) m-n  B) m+n  C) mn  D) mn^2 -mn  E) mn^2
mn(n-1) = mn^2 -mn   Answer : mn^2 -mn
<result>D</result>
If m and n are positive integers and n ≠ 1, then mn(n −1) is