Borin Georin (kekbot131a)

Race #765

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Official speed 52.79 wpm (84.33 seconds elapsed during race)
Race Start April 12, 2018 5:06:10am UTC
Race Finish April 12, 2018 5:07:35am UTC
Outcome Win (1 of 3)
Opponents 2. stefanbm (51.63 wpm)
Accuracy 97.0%
Points 56.31
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.