This math topic involves advanced probability and counting strategies. Specifically, it focuses on calculating the probability of rolling four dice and achieving a mixed set of outcomes, where not all the dice show the same number. Each question presents various equations and asks to select the correct one that represents the likelihood of this scenario. The skills practiced include understanding the fundamentals of probability, manipulating fractions, and applying these concepts to solve problems related to multiple dice rolls.
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What is the equation for the chance of rolling a mixed set (not all the same number) on these dice?