Jordan's science teacher tells him that some unknown subset of four colored chemicals will be clear when combined. Jordan systematically goes through all possible subsets to find the one that produces the solution that is clear in color. Which Piagetian stage does this represent?

Question

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Jordan is demonstrating the ability to think abstractly and systematically solve problems, which are characteristics of the formal operational stage according to Piaget's theory of cognitive development.

Jordan's Science Teacher Tells Him That Some Unknown Subset of Four