it would stand to reason when the possibilities get larger than 366, you are probably going to have two people with the same birthday

Not probably but definitely.

If you have a group of 366 (or more) people you always have 2 people that share the same birthday (assuming a non-leap year).

This reasoning is called "pigeonhole principle".

In reply to Re^3: Birthday Chances by morgon
in thread Birthday Chances by YuckFoo

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