Which product design innovation made Texas Instruments' TI-84 graphing calculator maintain its dominant market position in mathematics education despite the rise of smartphones?

The design of mathematical calculators has evolved dramatically over the decades, transforming from simple counting tools to sophisticated computing devices. Each iteration brought innovations in product design that changed how students, professionals, and mathematicians interact with calculations. This trivia tests your knowledge about pivotal product design decisions that revolutionized mathematical tools and their market positioning.

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Standardized test acceptance - TI strategically ensured their calculators were approved for major exams like SAT, ACT, and AP tests
Superior processing power - TI-84 calculators offer computational abilities exceeding those of modern smartphones
Lower price point - TI continuously reduced prices to make their calculators more affordable than competing technologies
Subscription model - TI pioneered a software subscription service giving users access to new mathematical functions monthly