Let X be the winnings of a gambler. Let p(i)-P(X-i) and suppose that
p(O)=1/3, p(1)=p(-1)=13/55, p(2)=p(-2)=1/11, p(3)=p(-3)=1/165.
Compute the conditional probability that the gambler wins i, i=1,2,3 given that he wins a positive number.