After taking out the first mouse (a brown one), there are 9 mice remaining in the cage, 4 white ones and 5 brown ones. The probability, then, that the second mouse will be a white one is computed as follows:
P = (Number of White Mice Remaining in the Cage) / (Total Number of Mice Remaining in the Cage)
Let me know what you get.
3/8/2014

Philip P.
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