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AP EAMCET202022 Sep 2020Morning ShiftMathematicsProbabilityActual

Given that a throw of three unbiased dice shows different faces, what is the probability that their total is eight?

Options

  1. A1 10
  2. B23 256
  3. C13 36
  4. D17 20

Correct answer

A. 1 10

Step-by-step solution

Number of ways to get different faces on the a throw of three unbiased dice are ^6 C₃= 6 5 4 3 2 =20 and the number of ways to get their total is eight (1,2,5),(1,3,4) only. So, the required probability = 2 20 = 1 10 Hence, option (1) is correct.

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