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WAEC Mathematics 2019 Paper

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Question : 18

Total: 50

There are 8 boys and 4 girls in a lift. What is the probability that the first person who steps out of the lift will be a boy?

$\frac{1}{6}$
$\frac{1}{4}$
$\frac{2}{3}$
$\frac{1}{2}$

Solution:

Total number of people in the lift = 8 boys + 4 girls

= 12 people

probability that a boy comes out = $\frac{8}{12}$ = $\frac{2}{3}$

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