Question: For this problem, assume that a year has 365 days. (a) How many ways can 18 people have different birthdays? (b) What is the probability

For this problem, assume that a year has 365 days. 

(a) How many ways can 18 people have different birthdays? 

(b) What is the probability that nobody has the same birthday in a group of 18 people? 

(c) What is the probability in a group of 18 people that at least 2 people have the same birthday?

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