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A happy trio (Posted on 2014-10-09) Difficulty: 3 of 5
What is the probability that on campus of 730 students there exists at least one triplet of students celebrating their birthday on the same date?

Rem: Assume a year of 365 days

No Solution Yet Submitted by Ady TZIDON    
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Approximation | Comment 1 of 3
It's about 99.999999999999999999999999999999999999999%.  (I haven't really done the math, so I don't know how many more 9's there are, but there are a lot).  This is a near-certainty.  The only way to not have a triplet is if there were two people born on each of the 365 days in the year.
  Posted by Steve Herman on 2014-10-09 12:19:44
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