thank you polishing (abigail_w)

Race #7617

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Official speed 113.27 wpm (39.30 seconds elapsed during race)
Race Start September 18, 2018 8:52:37pm UTC
Race Finish September 18, 2018 8:53:16pm UTC
Outcome No win (2 of 5)
Opponents 1. atthetop (114.03 wpm)
Accuracy 98.0%
Points 120.82
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.