From an urn containing 6 white and 4 black balls, 3 balls are accidentally taken out without returning.
| August 3, 2020 | Education
From an urn containing 6 white and 4 black balls, 3 balls are accidentally taken out without returning. How likely are all the balls taken out to be white?
When selecting without returning, the order of items can be ignored
P = 6! 3! 7! / 3! 3! 10! = 1/6
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