What is the probability of throwing a 2 on a dice?

Probabilty is (# of desired outcomes) divided by (# of total possible outcomes) or d/t so

rolling the number 2

that is 1 number on a standard 6 faced die

1 desired outcome

6 possible outcomes

1/6 is the probility of rolling a 2 on a dice in one roll

The probability would be 1/6.