When we have actually a probcapacity question that asks the probcapacity of one event OR another occasion, we desire to ADD the 2 probabilities together.
You are watching: What is the probability of rolling doubles
If the question were what is the probability of rolling a 3 or a 4 on one die, the answer would be the probcapacity of rolling a 3 (1/6) PLUS the probability of rolling a 4 (1/6), or 2/6 = 1/3.
Here we have actually two dice. The variety of various outcomes on 2 dice is the number of different outcomes on the initially die (6) TIMES the number of different outcomes on the second (6), or 36.
However, 1 1 was already counted when we counted the number of methods to roll doubles. That is, there"s no way to roll a sum of 2 without rolling doubles. So the number of ways of rolling doubles OR a sum of 2 is still only 6.
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