imo class 12 probability

A fair die is thrown twice. Given sum is 7, probability first die shows 3 is:

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A fair die is thrown twice. Given sum is 7, probability first die shows 3 is:

  • A. 1/6
  • B. 1/3
  • C. 1/2
  • D. 2/3

Answer: A) 1/6

Explanation: Sum 7 outcomes are 6 equally likely pairs. Only (3,4) fits. Probability=1/6.

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