Iknow how to do a and b but don't understand c

(a)for statements p, q,andr, show that ∧q)⇒≡∧(∼r))⇒(∼

(b)for statements p, q,andr, show that ∧q)⇒≡∧(∼r))⇒(∼

(c) for fixed integers m and n, use part (a) and part (b) to restate the following implication in two different ways : if m is even and n is odd, then m + n is odd