maybe half the time (framed_phoenix)

Race #15426

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Official speed 120.83 wpm (36.85 seconds elapsed during race)
Race Start January 2, 2019 11:14:36am UTC
Race Finish January 2, 2019 11:15:13am UTC
Outcome No win (2 of 2)
Opponents 1. jessegarcia (137.78 wpm)
Accuracy 98.0%
Points 128.89
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.