mathhigh school
posted by rick .
If the probability of an event happening is 2/5, then the probability of the event not happening is 3/5? This is False. The answer is 1/3. Explain why the answer is 1/3

mathhigh school 
Damon
As far as I know the probability of it happening + the probability of it not happening sum to 1. Therefore I believe the answer is 3/5.
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