JEE Main 2011 Mathematics question
Let A and B be two symmetric matrices of order 3 . This question has Statement −1 and Statement −2. Of the four choices given after the statements, choose the one that best describes the two statements. Statement −1 : A(BA) and (AB)A are symmetric matrices. Statement - 2 : AB is symmetric matrix if matrix multiplication of A and B is commutative.
Answer: (1)
Solution
(ABA)^T = A^TB^TA^T = ABA, so A(BA) = (AB)A is symmetric for any symmetric A, B — Statement 1 true. , so AB is
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