SOLUTION: Roz and Simon each throw a fair dice. Calculate the probability that the sum of the two numbers obtained is 4

Question 831858: Roz and Simon each throw a fair dice.
Calculate the probability that the sum of the two numbers obtained is 4
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Looking at the possible rolls and sums(36 in total),
1 1 2
1 2 3
1 3 4
1 4 5
1 5 6
1 6 7
2 1 3
2 2 4
2 3 5
2 4 6
2 5 7
2 6 8
3 1 4
3 2 5
3 3 6
3 4 7
3 5 8
3 6 9
4 1 5
4 2 6
4 3 7
4 4 8
4 5 9
4 6 10
5 1 6
5 2 7
5 3 8
5 4 9
5 5 10
5 6 11
6 1 7
6 2 8
6 3 9
6 4 10
6 5 11
6 6 12
.
.
.
Only three of them sum to 4 (1 3, 2 2, 3 1), so then the probability
P(sum=4)=

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