Jake (jacks_1)

Race #3

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Official speed 73.26 wpm (60.77 seconds elapsed during race)
Race Start December 16, 2019 6:18:55pm UTC
Race Finish December 16, 2019 6:19:56pm UTC
Outcome Win (1 of 4)
Accuracy 96.0%
Points 78.14
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.