hard · GRE Quant
A two-way table from a university research archive contains 37 people. 18 uses rail, 23 arrives before 8, and 11 satisfy both conditions. If one person is selected at random from those who arrives before 8, what is the probability that the person uses rail?
- 11/37
- 11/23
- 11/18
- 18/37
- 12/23
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