Discrete maths

AST21111 Assignment 3 Question 4 [12 marks] Prove by contradiction: "For any integer n, (n2-2) is not divisible by 4." AST21111 Assignment 3 Question 5 [10 marks] Prove by contraposition: "For all integers m and n, if mn is even then m is even or n is even." AST21111 Assignment 3 Question 6 [12 marks] Prove by mathematical induction: "(5" + 9)