At each branch point in a decision tree,where the decision maker does not have control,the probabilities must sum to 1.0.

Name: At each branch point in a decision tree,where the decision maker does not have control,the probabilities must sum to 1.0.
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This is because at each branch point, the decision maker is faced with mutually exclusive options, and the probability of each option must be accounted for. Therefore, the sum of the probabilities of all options must equal 1.0.

At Each Branch Point in a Decision Tree,where the Decision