October 20–October 26, 2009
Two hunters, Alex and Boris, set out to hunt ducks. Each of them hits as often as he misses when shooting at ducks. Alex shoots at 50 ducks and Boris shoots at 51. What is the probability that Boris bags more ducks than Alex?
List of solvers
Steve Alkire, Jonathan Shi, Huy Hoang-Nguyen (undergrad), T.R. Mukundan, Lincoln Atkinson, Vikas Hamine, Qiyuan Wei, Congpa You, Mike Goodman, Lloyd Sakazaki, Hardik Bati (outside).
Huy Hoang-Nguyen wins the prize!