Question:
A survey shows that $63 \%$ of the people in a city read newspaper $\mathrm{A}$ whereas $76 \%$ read newspaper B. If $x \%$ of the people read both the newspapers, then a possible value of $x$ can be:
Correct Option: , 4
Solution:
$n(B) \leq n(A \cup B) \leq n(U)$
$\Rightarrow 76 \leq 76+63-x \leq 100$
$\Rightarrow-63 \leq-x \leq-39$
$\Rightarrow 63 \geq x \geq 39$