The expression mn+m is odd when the m and n are integers. Which of the following expressions must be even? Choose the most appropriate option
A) m	B) n	C) m + n	D) mn - m	E) m + n^2
mn+m is odd   m and n are integers   If m were even mn+m would be even despite any value of n.   n can't be odd, so n must be even.   Ans : n
<result>B</result>
The expression mn+m is odd when the m and n are integers. Which of the following expressions must be even?