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Why does the sum of all probabilities of any experiment always end up as 1?

User Plusor
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The probabilities add up to 1 because probabilities are measured in percentages. 1 = 100%, 0.5 = 50%, etc. If the probability of an outcome was 1, there would be no other possible outcomes because that outcome would have a 100% chance of occurring each time.
User Jacques MALAPRADE
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