Jesus (johangodinho123)

Race #4267

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Official speed 41.03 wpm (108.51 seconds elapsed during race)
Race Start June 25, 2020 11:10:24am UTC
Race Finish June 25, 2020 11:12:13am UTC
Outcome No win (4 of 4)
Opponents 1. morgoth890steno (61.66 wpm)
Accuracy 94.0%
Points 43.77
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.