In a room of 23 people there is a 50% chance that 2 people have the same birthday! ๐คWhatโs more is that in a room of 70 people this chance is 99.9%! ๐ค๐ค This might seem strange since there are only 23 people and 365 possible days to have a birthday. However if we think about pairs of people, 23 people gives 23*(23-1)/2 = 253 pairs which is more than half of 365. Using this and some basic probability we can calculate the percentage chance given any number of people๐ฅณ

The understanding of this โbirthday problemโ has been used in computer hacking ๐ป

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