If you use 10 fold CV in Weka, then on the result pane, all you see is the average results of 10 different models on 10 different folds. But after that, Weka deletes all of these models. So, if you save the model you built from 10 fold CV, then this is the exact same model if you had chosen "Use training set". Remember: If you use 10 fold CV and save that model, then it is neither the best performing model nor the average of 10 models rather it is the model created using the entire training set.
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