Question

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

Answer 1

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

$n(B^{{}^{\prime }}\cap A)$ will have the elements outside $B$ but which also elements of $B$.

So, $B^{{}^{\prime }}\cap A$ is the region between the circles of $A$ and $B$.

$\Rightarrow n(B^{{}^{\prime }}\cap A)=43-27=16$