We have a bag with different color marbles. We select three, with replacement. The probability distribution for the number of red marbles is given by Red Marbles 0 1 2 3 Probability 1/8 3/8 3/8 1/8...

We have a bag with different color marbles. We select three, with replacement. The probability distribution for the number of red marbles is given by

For this distribution, the probability of two or more red marbles is given by