BAKES (mattattack1223)

Race #3257

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Official speed 82.97 wpm (53.66 seconds elapsed during race)
Race Start December 25, 2018 1:24:00am UTC
Race Finish December 25, 2018 1:24:54am UTC
Outcome Win (1 of 5)
Opponents 3. elliot_notts (69.42 wpm)
Accuracy 95.0%
Points 88.50
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.