How many matches do we have so far? Is anyone keeping track? What was the purpose of this in the first place?
A standard trick in Intro to Statistics classes is to ask everyone their birthday, and usually there is a match! It turns out that if you do the math the 50/50 probability of getting a match occurs at 23 random entries!
With most classes being 30-40 students, a match is rarely avoided. And the number of entries needed for birthdays on consecutive days is only 14!
For you masochists, here's the math.
http://mathworld.wol...dayProblem.html
Cheers
(fannum considers all these 20 year olds bemoaning their advancing birthdays, and grumbles "damn whippersnappers!")