What is the negation of "x is odd and y is even"? I'm not sure if I find the correct answer to this question. 
Using De Morgan's law;
¬(a∧b)=(¬a)∨(¬b)
so it becomes:
X is not odd OR Y is not even
or also we can say,
X is even OR Y is ODD.
Can somebody correct me if I'm wrong OR tell me if I'm right :)

Well, not odd means even, and not even means odd. Hence, you're absolutely correct.^^
