Problem 1272. The almost-birthday problem.

This is a harder version of the birthday problem. Now, you will have to determine the probability that two or more people in a randomly assembled group of n people are having their birthdays within d days of each other. As usual, ignore the leap year and assume that every day is equally probable.

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33.66% Correct | 66.34% Incorrect
Last Solution submitted on Oct 18, 2025

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