Weird& Wonderful random maths fact πŸ‘€

In a room of 23 people there is a 50% chance that 2 people have the same birthday! πŸ€”What’s more is that in a room of 70 people this chance is 99.9%! πŸ€”πŸ€” 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 peopleπŸ₯³

The understanding of this β€˜birthday problem’ has been used in computer hacking πŸ’»


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