Anik (filtercopy)

Race #5004

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Official speed 50.66 wpm (87.88 seconds elapsed during race)
Race Start September 27, 2019 9:22:49pm UTC
Race Finish September 27, 2019 9:24:17pm UTC
Outcome No win (5 of 5)
Accuracy 94.0%
Points 54.04
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.