Question

If $A\subset B,$ then which of the following is not true?

• A. $A\cup B=B$
• B. $A\cap B=B$
• C. $A\cap B=A$
• D. $A-B=\Phi$

Answer 1

The correct option is B $A\cap B=B$


Clearly, from the Venn diagram, we can conclude that
$A\cap B\ne B$
All other options are true.