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3
questions
5
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Probability that among $n$ random people, at least two have coinciding or successive birthdays
I found the following riddle:
What is the probability that among $n$ people chosen randomly, at least two of them have their birthdays with at most one day difference.
Note: December 31 and January ...
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1
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Family Members Birthday Dates all different, but our birthdays will fall on same day, even Leap Years. There is a total of 9 in this Birthday Club. .
I can compile a list if needed and post, but I noticed this over 50 years ago, My Father, My Brother and Myself our Birthdays fall on the same day of the week every year. Even Leap years, that does ...
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3
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If people sharing the same birthday raise their hand, how many hands do you expect to see raised?
The following question is taken from an interview book assuming that no calculator is provided.
Question: There are $25$ people at a party. One person asks everybody to annouycne their birthday, ...
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