Question

Set $A$ and $B$ have $3$ and $6$ elements respectively. What can be the minimum number of elements in $A \cup B$ ?

• A. 18
• B. 9
• C. 6
• D. 3

Answer 1

Answer: (C)

6

Answer 2

Given, $n\left(A\right)=3$ and $n \left(B\right)=6$ $\therefore$ min $\left(A \cup B\right)=n \left(B\right)=6$