Problem 1: 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: I am little bit confuse in answer 1/2 and 3/4
Answer 1/2: There is two bags.One containing black balls and other contain 1 black and 1 white ball. If I drawn 1st ball black then the 2nd ball is also black if I chose the bag which contain 2 black ball. So to get 2nd ball also black probability is 1/2.
Answer 3/4: Total ball 4. 1st one drawn. So next one when drawn probability of getting black ball is 3/4 compare to remaining ball.
Which one is correct?