JEE Main 20244 Apr, Morning shiftMathematicsHardStatistics and Probability258× since 2002
Three urns A, B and C contain 7 red, 5 black; 5 red, 7 black and 6 red, 6 black balls, respectively. One of the urn is selected at random and a ball is drawn from it. If the ball drawn is black, then the probability that it is drawn from urn is :