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AP EAMCET202023 Sep 2020Morning ShiftMathematicsProbabilityActual

Three dice are thrown, given that they have a sum of 8 , the probability that one of them is four is ______

Options

  1. A9 11
  2. B3 7
  3. C4 9
  4. D3 8

Correct answer

B. 3 7

Step-by-step solution

Sample Space 1 , 1 , 6 → 3 1 , 2 , 5 → 6 2 , 2 , 4 → 3 ( 2 , 3 , 3 ) → 3 ( 1 , 3 , 4 ) → 6 P = 6 + 3 21 = 9 21 = 3 7

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