They don't HAVE to - it's just the way dice have always been marked. You could have a dice that has 6 & 5, 3 & 4 and 1 & 2 on opposite sides - it would still be a dice but wouldn't follow the 'opposites total 7' rule.
42, 63, 84 and 105.
There are eleven possible "sums of dots" if you throw two 6-sided dice. The range of possible values is from 2 (1+1) to 12 (6+6).
1/4
The sum can be any number from 2 to 12.That's 11 possible outcomes.
2/9!
never.. the highest number on a dice is a 6
It is 6/36 = 1/6.
Prob = 4/36 = 1/9
Yes, quite easily.
It is 30/36 = 5/6
33,33333...%
The probability of a sum of seven if you roll two dice is 6/36 or 1/6. There are 6 ways to roll a 7; (6,1) (5,2) (4,3) (3,4) (2,5) & (1,6) and 36 possible outcomes.