A bag contains an unknown number of red balls and yellow balls. When N balls are drawn at random (without replacement) the probability that they are all yellow is 1/2. The number of balls in the bag is the minimum for this to happen.

If the first N balls were all yellow, what is the probability that the next ball drawn is red?

Express the probability as a function of N.

(In reply to some exceptions by Charlie)

Those sporadic ones are interesting.  1<r<y

Posted by Jer on 2024-04-17 10:10:44