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keisanHigh-precision calculations for everyday life and work

Probability of Matching One’s Own Birthday

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Calculates the probability that someone else in the group has the same birthday as you.
Number of people in the group, including yourself
People
The probability that someone shares your birthday %
The probability that someone in the group has the same birthday as you
\(\normalsize\\ \hspace{20px}p(n)=1-\overline{p}(n)=1-({\large\frac{364}{365}})^{n-1}\\\)


This calculation does not take leap years into account.

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Probability of Matching One’s Own Birthday | Keisan