Hi,
I recently came across the famous Buffon's needle problem (<http://en.wikipedia.org/wiki/Buffon%27s_needle>), and there is no doubt that the problem as well as its answer are elegant.
However, the problem I have in mind, is slightly modified. The original problem deals with parallel lines separated by fixed distance (say, m). What if there are squares of side m instead of just parallel lines? How will this affect the probability?
I scratched my brain over this, but could not come up with anything. Can some genius crack this for me?


Regards,
Salil



Buffon's needles revisited
This is solved in *Fifty Challenging Problems in Probability with Solutions*, the 1965 book by Frederick Mosteller (Problem #54). A very good book to have around in any case.


