Question about Millennium Sofsource Mathematics Probability & Statistics for PC

# Roll two dice once. what is the probability that the sum is 7? solution pls.

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There are 36 possible outcomes for rolling 2 dice once: (1,1), (1,2), (1,3) ...(1,6)
Of those, only the following 6 outcomes sum to 7: (2,1), (2,2),(2,3) ...(2,6)
(1,6) (3,1) .... (3,6)
(2,5) . .
(3,4) . .
(4,3) . .
(5,2) (6,1),(6,2) ... (6,6)
(6,1)
Therefore, the probability is 6/36 = 1/6 = .167

Posted on Mar 11, 2011

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