The Birthday Problem & More

IB Maths: Analysis & Approaches: The Birthday Problem & More

What is commonly referred to as the Birthday Problem asks the question: What is the minimum number of people in a group so that the probability that at least two people in the group (ignoring leap years) is more than 50%. The answer of 23 surprises most people because it is considerably less than expected. For a group of 23 people the probability that at least two people share the same birthday is approximately 0.5073...


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