shaik (luffy_18)

Race #100

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Official speed 54.10 wpm (82.29 seconds elapsed during race)
Race Start July 19, 2020 8:32:00am UTC
Race Finish July 19, 2020 8:33:23am UTC
Outcome Win (1 of 3)
Accuracy 94.0%
Points 57.70
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.