Probability · Total probability theorem
Bag A contains 9 white and 8 black balls, while bag B contains 6 white and 4 black balls. One ball is randomly picked up from the bag B and mixed up with the balls in the bag A. Then a ball is randomly drawn from the bag A. If the probability, that the ball drawn is white, is , , then is equal to
- (1)22
- (2)23
- (3)24
- (4)21
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See the full 23 Jan 2026, Shift 2 paper
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