Paulo (hunter1991)

Race #194

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Official speed 68.47 wpm (65.02 seconds elapsed during race)
Race Start December 20, 2018 7:15:57pm UTC
Race Finish December 20, 2018 7:17:02pm UTC
Outcome No win (4 of 4)
Accuracy 98.0%
Points 73.04
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.