waecmaths question:
If $M=\{x:3\le x<8\}$ and $N=\{x:8<x<12\}$ , which of the following is true
I. $8\in M\cap N$
II. $8\in M\cup N$
III. $M\cap N=\varnothing $
Option A:
III only
Option B:
I and II only
Option C:
II and III only
Option D:
I, II and III
waecmaths solution:
$\begin{align} & M=\{3,4,5,6,7\} \\ & N=\{9,10,11,12\} \\ & M\cup N=\{3,4,5,6,7,9.10,11,12\} \\ & M\cap N=\varnothing \\ & \text{Option A is the correct option} \\\end{align}$
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