Question:
Let $A=\{x: x \in R, x \geq 4\}$ and $B=\{x \in R: x<5\} .$ Then, $n\left(A^{\prime} \cap B^{\prime}\right)=$
(a) $(4,5]$
(b) $(4,5)$
(c) $[4,5)$
(d) $[4,5]$
Solution:
(c) $[4,5)$
$A=\{x: x \in R, x \geq 4\}$ and $B=\{x \in R: x<5\}$
$A \cap B=[4,5)$
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