In roulette, the wheel contains 38 numbers. You pick a number, and the dealer spins the
wheel. If the roulette ball lands on your number, you win.
a. What is the probability that you win on the 13th try?
b. Let’s say you bet 2 $ for every try, and make 10$ when you win. What is the
probability that in 20 tries you don’t lose money?
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