A bag contains 7 blue balls and 5 yellow balls. If two balls are selected at random, what is the probability that none is yellow

  • 5/35
  • 5/25
  • 7/22
  • 7/33
  • 7/66
  • Explanation:

    Required probability = 7C2/12C2=7!/2!5!×10!2!/12!

    7×6/2×2/12×11=7/22

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A bag contains 7 blue balls and 5 yellow balls. If two balls are selected at random, what is the pro
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