There are totally 12 numbers on two dices. 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6
The possibility of getting the sum of 4 from two dices are
1 + 3
3 + 1
2 + 2
2 + 2
There are totally 36 different possibilities of getting a sum of numbers from both dices.
There are 8/36 possibilities to get a sum of 4, which simplifies to 2/9