question_answer

An urn contains 5 red and 2 green balls. A ball is drawn at random from the urn. If the drawn ball is green, then a red ball is added to the urn and if the drawn ball is red, then a green ball is added to the urn; the original ball is not returned to the urn. Now, a second ball is drawn at random from it. If the probability that the second ball is red is \[\frac{a}{b},\] then \[a\times b=\]

Answer:

1568