Probability · Question 19 · Easy
Two fair dice are thrown. What is the probability that the sum of the numbers is a prime number?
- 1/3
- 7/18
- 1/2
- 5/12
Answer and explanation
Answer: D. 5/12
Explanation: Prime sums are 2, 3, 5, 7 and 11, occurring in 1 + 2 + 4 + 6 + 2 = 15 of the 36 outcomes. Probability = 15/36 = 5/12.
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