Question

Use the given figure to find :
Given, $n($ $\xi$ $)=52$, $n\left(A\right)=43$ and $n\left(B\right)=27$.

n(B${}^{{}^{\prime }}$)

Answer 1

Given, $n\left(\xi \right)=52,n\left(A\right)=43,n\left(B\right)=27$

$n\left(B^{{}^{\prime }}\right)$ will have the elements outside $B$

$\Rightarrow n\left(B^{{}^{\prime }}\right)=\xi -n\left(B\right)=52-27=25$