Probability
Addition Theorem
Premium Question
Grade 12

Question:

Two dice are thrown simultaneously. The probability of getting a total of either 9 or 11 is:
(1) $\frac{1}{9}$
(2) $\frac{1}{6}$
(3) $\frac{5}{36}$
(4) $\frac{1}{12}$

Step-by-Step Solution

Key Concept: Count the number of ordered pairs giving a sum of 9 and the number giving a sum of 11 separately — since these two events cannot occur together, the probabilities simply add.
The detailed step-by-step mathematical proof is available inside the Mathbee app workspace.
Correct Answer: (2)

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