There are 2 balls in an urn. Each ball is either white or black. If white ball is put into an urn and there after ball is drawn at random from urn, probability that it is white is?

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Please find below the solution to the asked query:

There are 3 cases:Both balls are whiteBoth balls are blackOne black ball and one white ball.Probability of getting one of these cases=13Hence after adding a white ball, we haveThree balls whiteThree balls blackTwo balls white and one ball blackHenceRequired Probabilty=13×33+13×03+13×23=13+29=39+29=59 Answer

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