I answered this question : https://math.stackexchange.com/questions/549841/a-game-of-probability
And was ask for a delete, because the question is a part of some current challenge on a site. I was down voted by the guy who seems to be in charge of the challenge. What should I do ?
P(it's not a duck)=0
, the OP does both look like a duck and quack like a duck. $\endgroup$ – user14972 Nov 3 '13 at 17:44