Suppose m and n are positive odd integers. Which of the following must also be an odd integer?
Answer Choices
A. m+3 n
B. 3 m-n
C. 3 m^{2}+3 n^{2}
D. (n m+3)^{2}
E. 3 m n
Suppose m and n are positive odd integers. Which of the following must also be an odd integer?
Answer Choices
A. m+3 n
B. 3 m-n
C. 3 m^{2}+3 n^{2}
D. (n m+3)^{2}
E. 3 m n