If you take a group of people born in a non leap year you would need 366 people for a 100% chance that someone shares a birthday but only 23 people for a 50% chance that somebody shares a birthday?
In: Mathematics
It’s a 50% that there is at least one match between 2 out of the 23 people. So for the first person there are 22 possible matches, for the second person 21 possible matches etc. the math works out to 50%.
Latest Answers