In the game of roulette, a steel ball is rolled onto a wheel that contains 18 red, 18 black, and 2 green slots. If the ball is rolled 20 times, find the probability of the following events.
A. The ball falls into the green slots 4 or more times.
Probability =
B. The ball does not fall into any green slots.
C. The ball falls into black slots 11 or more times.
D. The ball falls into red slots 10 or fewer times.
You can earn partial credit on this problem.