Answer :

Let A : Ball drawn from bag A


B : Ball is drawn from bag B


C : Ball is drawn from bag C


D : Ball is drawn from bag D


BB : Black ball


WB : White ball


RB : Red ball


Assuming all boxes have an equal probability for picking i.e.


We want to find P(A|RB), i.e. probability of selected red ball is from box A





Conclusion: Therefore, the probability of selected red ball is from box A is


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