The formula for probability is P(event A)= favorable outcomes/total #of outcomes. 0 means the event will not take place. 1 means certain event. When you are trying to find the probability of something, you are trying to find its outcome. For example, P(3 or even numbers) Given numbers 1-6 that you can use, try to solve this problem. The probability of pulling a 3 out of the numbers 1-6 is 1/6 because there are 6 numbers and only one 3. The probability of pulling an even number out of 6 numbers is 3/6 because there are still 6 numbers but now there are 3 even numbers out of the selection of numbers we have. Then for this problem we would add the two answers we got together and you get 4/6, which simplifies to 2/3.
P(3 or even #'s) 1/6 +3/6=4/6=2/3
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