If two dice are rolled one time, find the probability of getting a sum less than 5.
math - PsyDAG, Saturday, November 17, 2012 at 8:52pm
So you are talking about 1,1; 1,2; 2,1; 2,2, 1,3; or 3,1.
Each pair has a probability of 1/36. Either-or probabilities are found by adding the individual probabilities.