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What does X in “Xn” represents in the large number of experiments?

What does X in “Xn” represents in the large number of experiments? Correct Answer Number of levels

To make a full factorial search which would examine each possible combination of independent variable at appropriate levels could require a large number of experiments, xn, where x is the number of levels and n is the number of variables. This may be quite appropriate for three nutrients at two concentrations but not for six nutrients at three concentrations.

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