I am at the moment reading a book given to me five! years ago, the excellent Simon Singh's book about the Fermat impossibility (or whatever). It keeps you in a spell, I highly recommend it, and anyone can read it, requires no mathematical skills, and even presents a mathematical history dating back to Pythagoras...

Just to stress your braincells, could you tell me (my own quick estimate was a true embarassment) with no previous knowledge and without referencing or so:

Imagine a soccer game, 11 player on each team and a referee. What is the probability that any two people on the field have the same birthdays?

Gee, I am looking forward to this one...will of course provide answer and motivation. Good luck!

Just to stress your braincells, could you tell me (my own quick estimate was a true embarassment) with no previous knowledge and without referencing or so:

Imagine a soccer game, 11 player on each team and a referee. What is the probability that any two people on the field have the same birthdays?

Gee, I am looking forward to this one...will of course provide answer and motivation. Good luck!

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