If q and r are both odd numbers Z, which of the following must also be odd?
Choose the correct choice from the following choices.
A) q – r B) (q + r)^2 C) q(q + r) D) (qr)^2 E) q/r
We're told that q and r are both ODD numbers Z. We're asked which of the following must also be odd.   IF...   q = 1   r = 3   Answer A) q – r = 1-3 = -2 NOT odd   Answer B) (q + r)^2 = (1+3)^2 = 16 NOT odd   Answer C) q(q + r) = (1)(4) = 4 NOT odd   Answer (qr)^2) (qr)^2 = (3)^2 = 9 This IS O(qr)^2(qr)^2   Answer E) q/r = 1/3 NOT odd   Final Answer:   (qr)^2
<result>D</result>
If q and r are both odd numbers Z, which of the following must also be odd?