From an urn in which 16 white and 9 black balls take out 2 balls at random. Find the probability that both balls are black.
| December 5, 2020 | education
In total, we have 9 + 16 = 25 balls, 9 of which are black. Then the probability that both balls are black will be 9/25, or 0.36 (usually the probability is written in decimal fractions).
Answer: 0.36.
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