If n and m are integers and n^{2}+m^{2} is even, which of the following is impossible?
Answer Choices
A. n and m are even
B. n and m are odd
C. n+m is even
D. n+m is odd
E. none of these is impossible
If n and m are integers and n^{2}+m^{2} is even, which of the following is impossible?
Answer Choices
A. n and m are even
B. n and m are odd
C. n+m is even
D. n+m is odd
E. none of these is impossible