Please, give me some minutes to take over your question
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I'm working on it
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a probability model has some features
Events (This part is ok, the probabilities are between 0 - 1 )
1) p1 = 0.2
2) p2 = 0.5
3) p3 = 0.1
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The sample space is not 1 because p1+p2+p3 = 0.8
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Answer
FALSE. No, this is not a valid probability model