2. (a) Use a prove by contradiction to show that if a and b are nonzero integers such that a divides b and a + b is odd,
Posted: Tue Nov 16, 2021 6:55 am
2. (a) Use a prove by contradiction to show that if a and b are nonzero integers such that a divides b and a + b is odd, then a is odd. (b) Prove that if n is a positive integer, then n? #2(mod 4).