Because if there is absolutely no chance of something failing. For example lets say I have a standard deck of 52 cards what is the probably that I draw either a heart, a club, a spade, or a diamond. That covers every card in the deck meaning there is no way I did not get the outcome I wanted.
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The probability is 1.The probability is 1.The probability is 1.The probability is 1.
The probability is 1/2.The probability is 1/2.The probability is 1/2.The probability is 1/2.
If you roll the die often enough, the probability is 1 - a certainty.On a single roll, the probability is 1/6.If you roll the die often enough, the probability is 1 - a certainty.On a single roll, the probability is 1/6.If you roll the die often enough, the probability is 1 - a certainty.On a single roll, the probability is 1/6.If you roll the die often enough, the probability is 1 - a certainty.On a single roll, the probability is 1/6.
What is the probability that this question makes absolutely no sense? 1/1. or 100%
For any event A, Probability (not A) = 1 - Probability(A)