I have never lost a single typeracer (aaaaaaaaaaaaaaaaaaaaaaaa)

Race #396

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Official speed 78.17 wpm (56.95 seconds elapsed during race)
Race Start July 29, 2020 6:09:24am UTC
Race Finish July 29, 2020 6:10:21am UTC
Outcome No win (2 of 5)
Opponents 1. bently5102 (85.40 wpm)
3. notidell (77.53 wpm)
5. sarvottampriyadarshee (66.43 wpm)
Accuracy 96.0%
Points 83.38
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.