Out of 10 persons working on a project, 4 are graduates. If 3 are selected, what is the probability that there is at least one graduate among them?
Options.
A) 1/6 B) 5/8 C) 3/8 D) 5/6 E) 7/8
Explanation:   P(at least one graduate) = 1 - P(no graduates) =   1 - ⁶C₃/¹⁰C₃ = 1 - (6 * 5 * 4)/(10 * 9 * 8) = 5/6   ANSWER IS 5/6
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Out of 10 persons working on a project, 4 are graduates. If 3 are selected, what is the probability that there is at least one graduate among them?