### Instruction: Suppose that we roll two fair 6-sided dice.  What is the probability that the two numbers rolled sum to 4?### Response: To find the probability of an event, I need to divide the number of favorable outcomes by the number of possible outcomes.
In this case, the event is rolling two dice and getting a sum of 4.
The possible outcomes are all the ways of rolling two dice, which are 6 times 6, or 36.
The favorable outcomes are the ones where the sum is 4, which are (1, 3), (2, 2), and (3, 1).
There are only 3 favorable outcomes, so the probability is 3/36, or 1/12.