A bag contains 3 white and 2 black balls and another bag B contains 2 white and 4 black balls . A bag and a ball out of it are picked at random .The probability that the ball is white is

Answers (1)

Solution:

                  P(W)=P(A)P(fracWA)+P(B)P(fracWB)

                   P(W)=frac12cdot frac35+frac12cdot frac26=frac310+frac16=frac715.             

 

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