Statistics - M/C

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In a version of the game of roulette, a steel ball is rolled onto a wheel that contains 19 red, 19 black and 2 green slots. If the ball is rolled 25 times, the probability that it falls into the green slots two or more times:

a) is 5%.
b) is 35.8%.
c) is 12.7%.
d) cannot be determined since there are three possible outcomes of rolling the steel ball.

THE ANSWER IS B.
Can someone explain why.

Thanks

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