1.

For any two non empty sets P and Q, if \[P-Q=P\]and \[Q-P=Q,\]then ______

A.  \[(P\bigcup Q)'=\phi \]   
B.      \[P\bigcap Q=\phi \] 
C.  \[P\subset Q\]            
D.      \[Q\subset P\]
E.  None of these
Answer» C.  \[P\subset Q\]            


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