1 and 2 is 3 (2)
1 and 3 is 4 (3)
1 and 4 is 5 (4)
2 and 1 is 3 (5)
2 and 2 is 4 (6)
2 and 3 is 5 (7)
3 and 1 is 4 (8)
3 and 2 is 5 (9)
4 and 1 is 5 (10)
you have 36 different ways you can role and 10 of them are 5 or less so you have a 26/36 chance of rolling greater than 5