Concept explainers
Sifly puzzle. After a professor explains the Birthday Question to her class of 20, she points out that the probability of having a birthday match in the class is around 0.4. A student raises her hand and states that she is certain that there will be a birthday match. She knows no one’s birthday except her own. Explain why she was able to make this statement with such certainty.
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The Heart of Mathematics: An Invitation to Effective Thinking
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