Probabilty question on roulette for class-Need help ASAP

Here is the problem I have.
In the game of roulette, the ball is rolled 25 times, find the probabilities of the following events.
a. The ball falls into the green two or more times
b. The ball does not fall onto any green slots
c. The ball falls into black slots 15 or more times
d. The ball falls into red slots 10 or fewer times.

I assume you know there are 18 red, 18 black, and 2 green slots. Thanks a ton!