What brand strategy did Texas Instruments implement in the 1990s that cemented their graphing calculators as the dominant product in mathematics education?

Texas Instruments transformed mathematics education with their groundbreaking calculators. Beyond creating tools for calculations, they revolutionized how mathematics is taught and learned worldwide. This poll tests your knowledge of TI's strategic brand decisions that helped them dominate the educational calculator market for decades, making their products a staple in classrooms across the globe. Can you identify their key brand strategy that led to their unprecedented success?

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Educational partnerships with textbook publishers to include TI-specific instructions in mathematics textbooks
Celebrity endorsements from famous mathematicians and scientists
Offering the lowest-priced calculators on the market through aggressive retail promotions
Creating limited edition calculator designs with popular sports team logos