Probability
posted by Anonymous on .
9) A gumball machine has just been filled with 50 black, 150 white, 100 red and 100 yellow gum balls that have been thoroughly mixed. Sue and Jim, each purchased one gumball. What is the likelihood both Sue and Jim get red gumballs

Probability of both/events occurring is found by multiplying the probabilities of the individual events.
Note that after Sue picks a red gumball, there are one less red and one less total gumballs for Jim.
(100/400)(99/399) = ? 
1/5

0.062