The sample space for 2 dice is as follows:
(2, 3, 3, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 11, 11, 12)>>Total = 36
There are 15 ways of making up a prime number on a roll of 2 dice, but only one way of making up a 2, and that is: 1 +1 ==2,
Therefore the probabikity is: 1 / 15 ==6.67%