Answer:
If n + 4 is odd, then n is odd.
Explanation:
Contrapositive statements negate the original statement and interchanges(flips) it.
So the negated statement would be ' If n is odd, then n + 4 is odd'.
Then we interchange that statement so ' If n is odd, then n + 4 is odd' becomes, ' if n + 4 is odd, then n is odd.'