Odds in favor of rolling doubles with 2 dice?

The probability of rolling doubles is the probability of rolling any number time the probability of rolling the same number on the second die.

P (doubles) = (6/6) (1/6) = 6/36=1/6

You can also think of it like this:

There are 6 doubles that you can roll out of 36 total possible rolls which is also:

6/36=1/6