You roll two six-sided dice. What is the probability that the sum is less than 13? Write your answer as a fraction in simplest form

1/1, or 1. The highest sum you can get from rolling two six-sided dice, assuming the numbers on the sides are 1-6, is 12. 12 < 13. All possible sums are less than 13, so you have a 100% chance of getting a sum less than 13.