Do you mean a SUM of three? If you are rolling a PAIR of dice (meaning two cubes,) then the probability of rolling a SUM of three, meaning adding the two numbers shown on top, is 2/36, or 1/18.

Are you simply asking about rolling the dice and having ONE...

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Do you mean a SUM of three? If you are rolling a PAIR of dice (meaning two cubes,) then the probability of rolling a SUM of three, meaning adding the two numbers shown on top, is 2/36, or 1/18.

Are you simply asking about rolling the dice and having ONE of the two cubes show three dots on top, then the probability would be 2/12, or 1/6.