What is the probability of rolling a sum of 9 with two six-sided dice?

What is the probability of rolling a sum of 9 with two six-sided dice?

Approach: Count favorable outcomes over total outcomes.

1/9. Favorable outcomes: (3,6), (4,5), (5,4), (6,3). Total 36. 4/36 = 1/9.

Follow-up: What sum is most likely?

Key concepts: sample space, combinatorics.