SOLUTION: The mathmatics club at a certain university is composed of 15 undergraduate and 6 graduate students. Three students from the club were selected, and each was asked to teach a clas

Algebra ->  Probability-and-statistics -> SOLUTION: The mathmatics club at a certain university is composed of 15 undergraduate and 6 graduate students. Three students from the club were selected, and each was asked to teach a clas      Log On


   



Question 902252: The mathmatics club at a certain university is composed of 15 undergraduate and 6 graduate students. Three students from the club were selected, and each was asked to teach a class at a high school.
A) how many distinct groups of 3 students can be formed?
B) find the probability that the selected group has exactly two graduate students.
C) find the probability that the selected group has at least one undergraduate student.
Could someone help me with this Qs please

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
A) how many distinct groups of 3 students can be formed? 21C3
B) find the probability that the selected group has exactly two graduate students.
P = %286C2%29%2815C1%29%2F%2821C3%29
C) find the probability that the selected group has at least one undergraduate student.
P = 1 - P(no UG) = 1 - %286C3%29%2815C0%29%2F%2821C3%29