If one takes a group of 64 individuals, and asked them for their birthdates (day and month, not year), the chances of there being at least one match (at least two persons born on the same day of the same month), is 99% (actually about 995/1000).
"Logic" dictates that is should be 64/365 (or 1 in 6ish). Note, I say "logic".
Now, can a mathematically inclined person please explain to me in layman terms, why this is? (the 99% thing, not the "logic" thing!)
Oh, also, please will anyone else share any "weird" coincidences of a mathematical nature? (Not "One time, when my aunt was at the store, you will NEVER believe who she saw, buying tooth paste, no less"