Question

If $\zeta$ is the set of boys in your school and $B$ is the set of boys who play badminton. Draw a Venn-diagram showing that some of boys do not play badminton. If $n\left(\zeta \right)$ $=40$ and $n\left(B^{\prime }\right)=17$; find how many play badminton.

Answer 1

Given, $n\left(\zeta \right)$ $=40$ and $n\left(B^{\prime }\right)=17$

Number of boys who play badminton $=n\left(\zeta \right)-n\left(B^{\prime }\right)$$=40-17=23$