If $A$ and $B$ are any two sets,then $(A \cup B)'$ is equal to
- A$A' \cup B'$
- B$A' \cap B'$
- C$A \cap B$
- D$A \cup B$
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A closed tank has two compartments $A$ and $B$, both filled with oxygen (assumed to be ideal gas). The partition separating the two compartments is fixed and is a perfect heat insulator (Figure $1$). If the old partition is replaced by a new partition which can slide and conduct heat but does $NOT$ allow the gas to leak across (Figure $2$), the volume (in $m ^3$ ) of the compartment $A$ after the system attains equilibrium is. . . . . .
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