The fastest kid alive (tupapi11)

Race #1917

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Official speed 86.72 wpm (51.34 seconds elapsed during race)
Race Start August 3, 2019 9:28:30pm UTC
Race Finish August 3, 2019 9:29:22pm UTC
Outcome No win (2 of 4)
Opponents 4. gjuro_andrija (69.74 wpm)
Accuracy 97.0%
Points 92.50
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.