Question

When is $A$ called proper subset of $B$ ?

• A. $A\subset B,A\ne B$
• B. $A\subset B,A=B$
• C. $A\in B$
• D. $B\in A$

Answer 1

The correct option is A

$A\subset B,A\ne B$

For $2$ sets $A,B$
The set $A$ is called proper subset of $B$ if $A\subset B,A\ne B$.