Kern (kern_perker)

Race #53

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Official speed 71.46 wpm (62.30 seconds elapsed during race)
Race Start February 15, 2019 2:33:09pm UTC
Race Finish February 15, 2019 2:34:11pm UTC
Outcome Win (1 of 2)
Accuracy 96.0%
Points 76.22
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.