Find the probability of obtaining a sum of 9 from rolling 2 dice.

Answer 1

P(sum 9) = 4/36 = 1/9,

because positive outcomes 4(4:5, 5:4, 6:3 and 3:6),

total outcomes 6² = 36

Answer 2

Assuming that each of 36 possible outcomes are equally likely:

there are 4 outcomes with a sum of 9.

Probability = (count of success) / (count of outcomes) = 4 / 36 = 1/9