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Let A

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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