It’s like if I had a 1/10 chance of winning the lottery and I meet another person who also has a 1/10 chance of winning the lottery, then combined we have a 2/10 chance of winning the lottery.
The odds of a “coincidence” increases with each person: Me meeting a person with the same birthday: 1/365 Me and one other friend meeting someone with the same birthday: 1/(365/2) = 183 Three of us meeting someone with the same birthday: 1/(365/3) = 1/122 …
Same Birthday Odds It stands to reason that same birthday odds for one person meeting another are 1/365 (365 days in the year and your birthday is on one of them).
But consider this: If you get a group of 30 people together, two of them will almost definitely have the same birthday. There were 30 students in my undergrad statistics class and the professor said the odds of two of us having the same birthday were very high. We’re talking about every student having those odds.
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