question_answer

If \[P\cup Q=Q\] and \[P\cap Q=P\] then which among the following cannot be true?

A)  \[P=\{1,2,3\}\] and \[Q=\{1,\,\,2,\,\,3,\,\,4,\,\,5\}\]

B)  \[P=\{a,b\}\] and \[Q=\{a,b,c\}\]

C)  \[P=\{s\}\] and \[Q=\{m,n,s\}\]

D)  \[P=\{l,m,n\}\] and \[Q=\{l,m,1,2,3\}\]

E)  None of these