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For $$3 \times 3$$ matrices M and N, whichof the following statement(s) is (are) NOT correct ?
$$N^T M N$$ is symmetric or skew symmetric, according as M is symmetric or skew symmetric
M N - N M is skew symmetric for all symmetric matrices M and N
M N is symmetric for all symmetric matrices M and N
(adj M) (adj N) = adj (M N) for all invertible matrices and N
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