question_answer

Which among the following is not a proper subset of\[\left\{ a,\text{ }b,\text{ }c \right\}\]?

A)  \[\left\{ a,\text{ }b \right\}\]        

B)                    \[\left\{ a,\text{ }b,\text{ }c \right\}\]      

C)  {b, c}             

D)         \[\left\{ a \right\}\]

E)  None of these