One bag contains 5 white and 4 black balls. Another bag con…

Maths Probability Hard Single Correct MCQ

Published on: August 13, 2026

One bag contains 5 white and 4 black balls. Another bag contains 7 white and 9 black balls. A ball is transferred from the first bag to the second and then a ball is drawn from second. The probability that the ball is white, is

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The correct answer is:

Let a white ball be transferred from the first bag to the second. The Probability of selecting a white ball from the first bag

Now the second bag has 8 white and 9 black. The probability of selecting white ball from the second bag .

Hence required probability

If a black ball be transferred from the first bag to the second, then the probability

Therefore required probability

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