Need math help with a mathematics class that is composed of 11 freshmen, 7 sophomores, and 4 juniors.
A mathematics class is composed of 11 freshmen, 7 sophomores, and 4 juniors. Three of the freshmen, two of the sophomores, and one junior receive A grades in the course. If a student is selected at random from the class, find the probability that the student is each of the following. (Enter your probabilities as fractions.)
(a) an A student
(b) an A freshman student
(c) a sophomore
