If ${N_a} = \{ an:n \in N\} ,$ then ${N_3} \cap {N_4} = $
In a school, there are three types of games to be played. Some of the students play two types of games, but none play all the three games. Which Venn diagrams can justify the above statement ?
If $A$ and $B$ are two sets such that $A \subset B$, then what is $A \cup B ?$
If $A$ and $B$ are two sets then $(A -B) \cup (B -A) \cup (A \cap B)$ is equal to
If $A =$ [$x:x$ is a multiple of $3$] and $B =$ [$x:x$ is a multiple of $5$], then $A -B$ is ($\bar A$ means complement of $A$)