There is a box which contains 4 red, 3 blue and 1 black identical balls. For each red ball withdrawn (without replacement), you have to put 1 blue and 1 black ball in the bag. For each blue ball withdrawn (without replacement), you have to put 2 blue and 1 red ball. What is the probability that ball withdrawn at third attempt will be black, if first and second balls withdrawn were red and blue respectively?

There is a box which contains 4 red, 3 blue and 1 black identical ball

1.	There is a box which contains 4 red, 3 blue and 1 black identical balls. For each red ball withdrawn (without replacement), you have to put 1 blue and 1 black ball in the bag. For each blue ball withdrawn (without replacement), you have to put 2 blue and 1 red ball. What is the probability that ball withdrawn at third attempt will be black, if first and second balls withdrawn were red and blue respectively?
Answer» There is a box which contains 4 red, 3 blue and 1 black identical balls. For each red ball withdrawn (without replacement), you have to put 1 blue and 1 black ball in the bag. For each blue ball withdrawn (without replacement), you have to put 2 blue and 1 red ball. What is the probability that ball withdrawn at third attempt will be black, if first and second balls withdrawn were red and blue respectively?