WAEC 2019 · Paper 1 · Q18

Probability

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?

Worked solution (try it first)

There are $8 + 4 = 12$ people, each equally likely to step out first.
8 of them are boys, so the probability is $\frac{8}{12} = \frac23$ , option C.

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