Multiple choice

A dice is thrown twice. What is the probability of getting number 1 or 5 on the first throw, irrespective of the result of the second throw?

  1. 1/3

  2. 2/3

  3. 1

  4. 4/3

  5. 5/3
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A Correct answer
Explanation

Probability of getting a 1 on the first throw = 1/6 Probability of getting a 5 on the first throw = 1/6 Therefore, using Addition theorem of probability, the probability of getting number 1 or 5 on the first throw irrespective of the result of second throw = (1/6) + (1/6) = 1/3

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