Stoliers (stoliers)

Race #1137

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Official speed 67.62 wpm (65.84 seconds elapsed during race)
Race Start April 14, 2020 8:35:13pm UTC
Race Finish April 14, 2020 8:36:19pm UTC
Outcome Win (1 of 5)
Opponents 3. regneva17 (56.55 wpm)
Accuracy 96.0%
Points 72.13
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.