Kabir (chi_bear)

Race #1693

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Official speed 55.93 wpm (79.60 seconds elapsed during race)
Race Start September 13, 2019 1:07:25am UTC
Race Finish September 13, 2019 1:08:45am UTC
Outcome No win (2 of 4)
Accuracy 95.0%
Points 59.66
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.