Posted by eswar on Thursday, May 9, 2013 at 3:33am.
A 10 km race has 5 water stations set up around the course. What is the minimum number of people that must run in the race in order to guarantee that 10 people stop at the same set of water stations?

math  anonymous, Friday, May 10, 2013 at 10:18pm
Anyone know the answer?
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