@Mathematics @Mathematics 3 students are selected at random from a class consisting of 5 freshman, 3 sophomores, and 2 juniors. Find the probability that 2 freshman and 1 junior are selected given that at least 1 freshman is selected.

Question

anonymous · Answer

i know the probability of 2 freshman 1 junior is 5C2 * 2C1 / ( 10 C3)

anonymous · Answer

you know that you have at least one freshman, so so that is like saying "what is the probability that you select 1 freshman and 1 junior if you select 2 from a group of 4 freshmen, 3 sophomores and 2 juniors"