WAEC - Mathematics (2019 - No. 18)
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?
\(\frac{1}{6}\)
\(\frac{1}{4}\)
\(\frac{2}{3}\)
\(\frac{1}{2}\)
説明
Total number of people in the lift = 8 boys + 4 girls
= 12 people
probability that a boy comes out = \(\frac{8}{12}\) = \(\frac{2}{3}\)