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?

A 1/6

B 5/8

C 3/8

D 5/6

Correct Answer: Option D

P(at least one graduate) = 1 − P(no graduates)
= 1 − ⁶C₃/¹⁰C₃
= 1 − 6×5×4/10×9×8
= 1 − 1/6
= 5/6