Posted by: parbatya April 4, 2008
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Then it is 0.925
Probabilty of getting right in one container = 0.8
If it fails, probability of getting red on next container is = 2/10 x 5/10 = .125
The two will be added as both cases are likely to occur. It is like adding up two prob values when drawing the same colour ball from two different containers.
Just a thought. Mathematician can explain more.