Recently I recieved some help with binomial-solutions.
I will most likely come with more questions while I'm working my way through my homework.
In a bag there are 4 red marbles, 5 blue balls and 6 white balls. We select randomly and simultaneously 3 balls
from the bag. What is the probability for each of the following events;
a) The 3 balls have different colors.
I did: binomial(4, 1)*binomial(5, 1)*binomial(6, 1)/binomial(15, 3)
b) The 3 balls are all the same color.
I did: (binomial(4, 3)+binomial(5, 3)+binomial(6, 3))/binomial(15, 3)
c) The 3 balls consist of 2 of the same color and 1 of a different color.
This is the one I cannot figure how to make. Anyone? (: