Q12 of 14 Page 15

Two dice are thrown. What is the probability of obtaining a total of 10 or 11?

Let A be the event of getting a total of 10.
Let B be the event of getting a total of 11.
A = {(4, 6), (5, 5), (6, 4)}
B = {(5, 6), (6, 5)}
n(A) = 3
n(B) = 2
Therefore P(A) =
        and P(B) =
Since A and B are mutually exclusive
P (A∪ B) = P(A) + P(B) = +=
Therefore P(Obtaining a total of 10 or 11) = .

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