waecmaths question:
If a student is picked at random from the four Departments, what is the probability that he is not from the Education Department
Option A:
$\tfrac{3}{10}$
Option B:
$\tfrac{2}{9}$
Option C:
$\tfrac{5}{18}$
Option D:
$\tfrac{7}{10}$
waecmaths solution:
$\begin{align} & \Pr (E)=\frac{{{108}^{\circ }}}{{{360}^{\circ }}}=\frac{3}{10} \\ & \Pr (E)'=1-\frac{3}{10}=\frac{7}{10} \\\end{align}$
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