EMP Q.28

28A box A contains 2 white and 4 black balls. Another box B contains 5 white and 7 black balls. A ball is transferred from the box A to the box B, Then a ball is drawn from the box B The probability that it is white is

Option : A
Explanation : Probability of drawing a white ball from Box B will depend on whether
transferred ball is black or white.
If a black ball is transferred then its probability is 4/6
There are now 5 white and 8 black balls in the
box B. Then probability of drawing white ball
from the Box B = 5/13
Hence probability of drawing a white ball from
urn B, if the transferred ball is black

Similarly, probability of drawing a white ball
from urn E, if transferred ball is white

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