Question

We have 2 opaque bags, each containing 2 balls. one bag has 2 black balls and the other has a black ball and a white ball. you pick a bag at random and then pick one of the balls in that bag at random. when you look at the ball, it is black. you now pick the second ball from that same bag. what is the probability that this ball is also black?

Answer 1

1/2 The probability for the same is 1/2 as there can only be two outcomes and thus the answer is justified.