Mathematics · Probability
In a box there are 4 white balls and 6 black balls. A ball is drawn at random. If it is white, it is put back along with two more white balls into the box. If it is black, it is put back in the box and then two black balls are removed from the box. Now a ball is drawn again at random from the box. What is the probability that the second ball drawn is black?
- 115
- 214
- 313
- 412✓
Correct answer
12
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