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This is a short answer, give points/results. Given a data set with n observations, what is the size of a training set and validation set

This is a short answer, give points/results.

Given a data set with n observations, what is the size of a training set and validation set be for k-fold cross-validation? If we wished to perform leave-one-out cross-validation, what would be set the value of k to be?

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