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

P(A|B)={Probability of A given B}=P(AB)/P(B)

Can you figure it out from there?

anonymous · Answer

i know the probability of selecting 2 freshman and 1 junior, but i dont understand how to include that 'given at least 1 freshman' part .

anonymous · Answer

no i cant

anonymous · Answer

probability of 2 fresh and 1 junior is 
5C2 * 2C1 / ( 10 C3)

anonymous · Answer

thanks for your help. i already knew that formula .