dudududu (er132er)

Race #14519

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Official speed 106.89 wpm (41.65 seconds elapsed during race)
Race Start July 2, 2018 9:55:14am UTC
Race Finish July 2, 2018 9:55:55am UTC
Outcome Win (1 of 2)
Accuracy 98.0%
Points 114.02
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.