Q.

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 1
Answer» A. A∙B = B∙A
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