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17. The matrix A=  0 0 5 0 5 0 5 0 0  is a
1) scalar matrix               2) diagonal matrix            3) unit matrix            4) square matrix 


18. If A and B are symmetric matrices of same order then AB'-BA' is a.
1) skew symmetric matrix              2) null matrix
3) symmetric matrix                         4) none of these. 

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 18 https://www.meritnation.com/ask-answer/question/if-a-b-are-symmetric-matrices-of-same-order-then-ab-m/matrices/6302673
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