VijayaKumar (intvijay)

Race #163

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Official speed 57.14 wpm (77.91 seconds elapsed during race)
Race Start October 26, 2018 11:02:42am UTC
Race Finish October 26, 2018 11:04:00am UTC
Outcome No win (2 of 5)
Accuracy 96.0%
Points 60.95
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.