MCQ
If $A$ and $B$ be any two sets, then $(A \cap B)'$ is equal to
- A$A' \cap {\rm B}'$
- ✓$A' \cup B'$
- C$A \cap B$
- D$A \cup B$
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$(A)$ $N ^{\top} M N$ is symmetric or skew symmetric, according as $M$ is symmetric or skew symmetric
$(B)$ $M N-N M$ is skew symmetric for all symmetric matrices $M$ and $N$
$(C)$ $M N$ is symetric for all symmetric matrices $M$ and $N$
$(D)$ $(\operatorname{adj} M)(\operatorname{adj} N)=\operatorname{adj}(M N)$ for all invertible matrices $M$ and $N$