Which color scheme did Pearson adopt in their 2015 rebranding of college-level mathematics textbooks that resulted in a 23% increase in student engagement according to their research?

The publishing world of mathematics textbooks has undergone significant transformations in brand presentation and consumer engagement. Publishers carefully select color schemes for their mathematics textbooks to enhance learning, create brand recognition, and appeal to specific educational markets. This trivia question explores how one major publisher used color psychology to revolutionize their market position and influence student engagement with mathematical concepts.

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Blue and orange (complementary colors to reduce eye strain during long problem-solving sessions)
Red and black (traditional academic colors to convey authority and precision in mathematical content)
Green and purple (colors selected to differentiate from competitors and appeal to younger students)
Yellow and gray (minimalist approach focusing on highlighting key formulas and concepts)