Mr. lee's expository writing class (kayak1)

Race #55375

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Official speed 108.40 wpm (41.07 seconds elapsed during race)
Race Start September 23, 2017 10:32:14pm UTC
Race Finish September 23, 2017 10:32:55pm UTC
Outcome Win (1 of 5)
Opponents 3. walker49sull (100.21 wpm)
4. pfpigs (96.98 wpm)
5. darktilrisen (80.81 wpm)
Accuracy 97.0%
Points 115.63
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.