If we wanted to show that if n is an integer and 3n + 2 is even, then n is even by using a proof by contradiction, What should our proof attempt to show?
1) If n is an integer and is even, then 3n + 2 is even.
2) If n is an integer and 3n + 2 is odd, then n is odd.
3) If n is an integer and is odd, then 3n + 2 is odd.
4) If n is an integer and 3n + 2 is odd, then n is even.
5) If n is an integer and 3n + 2 is odd, then (n is odd and n is even).