Question

In a class of 18 students, 3 are math majors. A group of four students is chosen at random. (Round your answers to four decimal places.)
(a) What is the probability that the group has no math majors?


(b) What is the probability that the group has at least one math major?


(c) What is the probability that the group has exactly two math majors?

Answer 1

A.) is .4461 because 15*14*13*12 / 18*17*16*15

Answer 2

But cannot figure out what B.) & C.) is