Out of 9 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 correct choice from the following answers:
A) A)5/7  B) B)5/21  C) C)16/21  D) D)5/6  E) E)5/3
P(at least one graduate) = 1 - P(no graduates)   = 1 - ⁶16/21₃/¹⁰16/21₃   = 1 - (6 * 5 * 4)/(7 * 9 * 8)   = 16/21   Answer:16/21
<result>C</result>
Out of 9 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?