Iftakhar (tanvir021)

Race #392

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Official speed 40.80 wpm (109.12 seconds elapsed during race)
Race Start December 15, 2020 4:36:10pm UTC
Race Finish December 15, 2020 4:37:59pm UTC
Outcome No win (3 of 5)
Opponents 4. cwycindy115 (40.59 wpm)
Accuracy 94.0%
Points 43.52
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.