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If you buy a lottery ticket in 50 lotteries, in each of which your chance of...

If you buy a lottery ticket in 50 lotteries, in each of which your chance of winning a prize is 1/100, what is the (approximate) probability that you will win a prize?

A.) at least once?
B.) exactly once?
C.) at least twice?
D.) How many times do you expect to win?

math   Statistics-And-Probability   
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