Out of 7 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?  Choose the most appropriate option.
A) A)3/7
B) B)5/4
C) C)5/7
D) D)5/6
E) E)5/3
P(at least one graduate) = 1 - P(no graduates)   = 1 - ⁶C₃/¹⁰C₃   = 1 - (6 * 5 * 4)/(7 * 6 * 5)   = 3/7   3/7nswer:3/7
<result>A</result>
Out of 7 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?