Question No. 3. A is 5x1-matrix; B is 5x1-matrix. Thea AB is matrix of size (A) 1xS (B) A-Bdoesn't exist (C 5x1 (D) Not enough information to answer the question Question No. 4. Which of the following properties does not hold for matrix multiplication? (A) Commutativity (B) Distributivity (C) Associativity All of the above None of the above Not enough information to answer the question (D) (E) (F) Question No. 5 cet mly For matrices A, B and C;,the following statement (M.B.O)B1A (A) True if A, B and C are matrices of the same size (B) Always tue (C) Always false (D) True if A, B and C are invertible (B) True if A, B and C are invertible matrices of the same size (F) True if A, B and Care square matrices of the same size (G) None of the above (your answer (H) Not enough information to answer the question Question No.6. slst only one 4) omplete the following statement: matrix A = ) is invertible only if ) is noninvertible for all real values of x ) is invertible for all real values of is noninvertible only if x-.. None of the above (your answer: Not enough information to answer the