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Probability
1.Random experiment, experiment, we can't tell in advance that the results from each action is, but can tell what happens to the outcome. Throw coin coins such as 1 1 times.Dice 1 you 1 times. Duties may be 1 points, face up,,, 2 3 4 5 or 6 action we know the results, of course, is not considered a random experiment, such as the 2 plus 3 results is 5.
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