Question: A metallurgist is designing an experiment to determine the effect of flux, base metal, and energy input on the hardness of a weld. She wants

A metallurgist is designing an experiment to determine the effect of flux, base metal, and energy input on the hardness of a weld. She wants to study four different fluxes, two different base metals, and three different amounts of energy input. If each run of the experiment involves a choice of one flux, one base metal, and one amount of energy input, how many different runs are possible?

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