Homework Help: Math

Posted by kyle on Sunday, November 7, 2010 at 3:32pm.

A bag contains four balls. Three are red, and the fourth is either red or blue, selected with equal probability. A ball is drawn from the ball and it is red. What is the probability that one of the balls still in the bag is blue?

Math - PsyDAG, Monday, November 8, 2010 at 2:14pm
It all hinges on the probability of the fourth ball, which can either be red or blue, .5.

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