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18 Which of the following statements are always true 1 If A is a square...

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18 Which of the following statements are always true 1 If A is a square matrix then tr A tr A ii If A and B are matrices such that AB B then A I ii If A and B are symmetric matrices of the same size then the matrix AB is also symmetric a 1 only b all of them c i and iii only d i and ii only e ii and iii only

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