This question is known as the birthday problem: Assume that there are 365 days in a year (ruling out leap years) and that the same number of people are born on each day of the year. How many people...

This question is known as the birthday problem: Assume that there are 365 days in a year (ruling out leap years) and that the same number of people are born on each day of the year. How many people have to be (randomly arrive) in a room before the chance of having two people with the same birthday is at least 1/2?