Which innovative product launch strategy helped 'Mathematical Thinking' textbook series achieve record-breaking adoption rates in universities within its first year?

The mathematics textbook and educational software market is highly competitive, with publishers constantly seeking innovative launch strategies to gain market share. A successful product launch in this industry requires understanding both mathematical content quality and effective go-to-market approaches. This poll tests your knowledge of a famous mathematics textbook product launch that revolutionized the industry's approach to digital integration.

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Launching with a companion AI-powered problem-solving app that provided step-by-step solutions and personalized learning paths based on student performance analytics
Offering a lifetime guarantee to refund students if they didn't improve their test scores by at least one letter grade after using the textbook for one semester
Creating limited-edition versions with celebrity mathematician endorsements and exclusive content not available in regular editions
Implementing a subscription-based pricing model where students received physical textbooks for free but paid monthly fees for access to online assessments