Mathematics · Algebra
Two urns contain 4 white, 6 black balls and 5 white, 7 black balls, respectively. One ball is drawn at random from the second urn and transferred to the first urn. If two balls are then drawn at random from the first urn, find the probability that both balls are white.
- 141145
- 223165✓
- 352165
- 432155
Correct answer
23165
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