The question asks "A 6-sided cube has faces numbered 1 through 6. If the cube is rolled twice, what is the probability that the sum of the two rolls is 8?
The answer in the text is 5/36, but I think this is wrong. In particular, the answer suggests that the rolls that achieve a sum of 8 are (2,6), (3,5), (4,4), (5,3), and (6,2).
This misses off a "reverse" (4,4), such that the correct answer is 6/36, or 1/6. Please confirm that this is indeed an error in the book.