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BBB 2022 - Secondary 3 - Preliminary Round Question 20

BBB · BBB 2022 - Secondary 3 - Preliminary Round

Question 20

There are 5 black balls and 4 white balls. If 3 balls are drawn randomly. Find the probability that at least one ball is white.
  1. $\frac13$
  2. $\frac{20}{21}$
  3. $\frac35$
  4. $\frac{37}{42}$