Question 746935
There are 6 numbers on each die so the number of possibilities is 6*6=36

Now, the probability that the sum is at least 4, would be easier found by using
 1-P(sum is 3 or less)

Sums of 3 or less would include rolls of    1,1   1,2    2,1
therefore 3/36 or 1/12.  

So, P(sum is 4 or more) = 1-P(sum is 3 or less) = 1 - 1/12 = 11/12