Urn contains red and black balls and urn contains red and black balls. One ball is drawn at random from urn and placed in urn . Then one ball is drawn ball is drawn at random from urn and placed in urn , If one ball is now drawn at random from urn , the probability that it is found to be red, is
Explanation for correct option
Given: Let be the event that a red ball is drawn from urn and placed in urn
be the event that a black ball is drawn from urn and placed in urn
be the event that a red ball is drawn from urn and placed in urn
be the event that a black ball is drawn from urn and placed in urn
Let be the event that the red ball is drawn from urn
Hence, the required probability
Hence, option A is correct.