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From a bag with 5 white and 3 black balls, two balls are drawn together at random. What is the probability that both are black?

Competition practiceProbability & Permutation
  • A3/28
  • B9/64
  • C3/8
  • D5/14

Step-by-Step Solution

Ways to pick 2 black = 3C2 = 3; ways to pick any 2 = 8C2 = 28. Probability = 3/28.
Answer: A) 3/28

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