inconsistent (potangina666)

Race #5476

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Official speed 97.11 wpm (45.84 seconds elapsed during race)
Race Start May 10, 2020 10:32:58am UTC
Race Finish May 10, 2020 10:33:44am UTC
Outcome Win (1 of 5)
Accuracy 98.0%
Points 103.59
Text #3640570 (Length: 371 characters)

Property (c) is known as countable additivity. It is not something that can be proved, but it is like an assumption or an axiom. In our experience, we have seen that operating as if the assumption is correct leads to useful and credible answers to many problems, so we accept it as a reasonable assumption. Not all probabilists agree that countable additivity is natural.