David W. answered 12/14/16
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You "experiment."
"An event that consists of two or more simple events is called a compound event. For example, when a die is thrown, the event of number 1 turning up is a simple event. The event of getting an odd number consists of three simple events of getting 1, getting 3 and getting 5." -- Wikipedia
Probability is defined as: (number of successful events) / (total number of events)
So, you count the number of successful outcomes and divide by the total number of outcomes. For example, if you are observing the probability of getting a odd number followed by an even number, you roll the dice twice and add one to the total event count and, depending on whether that compound even was a success, you might add one to the successful event count. When you are done with the experiment, divide the results to get the experimental probability.