HMMT 2013 C2
- Combinatorics
- Answer
If Alex does not sing on Saturday, then she has a chance of singing on Sunday; however, to rest her voice, she never sings on both days. If Alex has a chance of singing on Sunday, find the probability that she sings on Saturday.
Dataset text NuminaMath olympiads. Quoted with source.
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\frac{2}{7}
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