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Probability question?
An urn contains 20 colored balls. Ten of the balls are black and ten are white. Three balls are drawn. Find the probability of drawing a black ball, then a white ball and then another black ball.
1 Answer
- 9 years agoFavorite Answer
first you draw one black with probability 0.5.
Next you draw white ball, but as the urn contains 9 black an 10 white, the probability is 10/19
Last ball is drawn with possibility 0.5.
So the probability you want to find is 0.5*0.5*10/19=5/38
