question 4b (3 marks)

Question 4a (3 marks): TRUE or FALSE ? Prove if True, give a counterexample if False. If A, B and Care an n x n matrices and A. (B - C) =A , then either A is the zero matrix O or (B - C) = I , i.e. is the identity matrix I. Solution: Question 46 (3 marks): TRUE or FALSE? Prove if True, give a counterexample if False. If A, B and C are n x n matrices such that A.B = A.C and matrix A is invertible, then B = C . Solution