For 3 xx 3 matrices M and N, which of th...

For `3 xx 3` matrices M and N, which of the following statement(s) is/are not correct?

`N^(T) MN` is symmetric or skew symmetric, according as M is symmetric or skew symmetric.

`MN-NM` is skew symmetric for all symmetric matrices M and N

MN is symmetric for all symmetric matrices M and N

(adj. M) (adj. N)= adj. (MN) for all intertiable matrices M and N

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The correct Answer is:

C, D

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