Which of the following is NOT correct? (A, B and C are matrices)(a) A.B = B.A(b) A.B.C = (A.B).C = A.(B.C)(c) C(A+B) = C.A + C.B(d) 1 A = A 1I have been asked this question in examination.The doubt is from Composite 2D Transformations topic in portion 2D Transformation and Viewing of Computer Graphics

Which of the following is NOT correct? (A, B and C are matrices)(a) A.

1.	Which of the following is NOT correct? (A, B and C are matrices)(a) A.B = B.A(b) A.B.C = (A.B).C = A.(B.C)(c) C(A+B) = C.A + C.B(d) 1 A = A 1I have been asked this question in examination.The doubt is from Composite 2D Transformations topic in portion 2D Transformation and Viewing of Computer Graphics
Answer» Correct CHOICE is (a) A.B = B.A The best explanation: MATRIX multiplication does not commute. We cannot SWITCH the ORDER of the factors and expect to end up with the same result. Hence, A.B ≠ B.A.

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