probabbility
posted by LC .
Find the (theoretical) probability of a given event, assuming that the dice are distinguishable and fair, and that what is observed are numbers uppermost.
Two dice are rolled; the numbers add to 7.
1

Out of 36 possibilities, 7 = 4&3, 3&4, 2&5, 5&2, 6&1 or 1&6. Each has a probability of 1/36.
To find the "eitheror" probability, add the individual probabilities.
P = 6/36 = 1/6