Answer :
1/3
Multiples of 3: 3,6,9,12
Therefore, you have a probability of 4/12 to get a multiple of 3, this simplifies to 1/3
1/3
Multiples of 3: 3,6,9,12
Therefore, you have a probability of 4/12 to get a multiple of 3, this simplifies to 1/3