NDA 2023 Mathematics question
One bag contains 3 white and 2 black balls, another bag contains 2 white and 3 black balls. Two balls are drawn from the first bag and put it into the second bag and then a ball is drawn from the second bag. What is the probability that it is white?
Answer: (B)
Solution
Transfer from the first bag: , , . The second bag then has 7 balls with 4, 3 or 2 white
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