K2 (kenji2)

Race #3265

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Official speed 65.05 wpm (68.44 seconds elapsed during race)
Race Start September 11, 2017 4:06:51pm UTC
Race Finish September 11, 2017 4:08:00pm UTC
Outcome No win (4 of 4)
Opponents 1. huuugh18 (97.16 wpm)
Accuracy 98.0%
Points 69.39
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.