Which marketing strategy has shown the highest conversion rate for university-level advanced mathematics textbooks in the past decade?

The mathematics education industry has seen significant shifts in how textbooks and learning materials are marketed and sold. Publishers have adapted their strategies as digital resources have become more prevalent. This poll tests your knowledge about how mathematics textbooks are marketed and distributed in today's educational landscape.

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Instructor testimonials and endorsements from renowned mathematicians
Free accompanying mobile apps with interactive problem sets
Student-focused social media campaigns featuring application examples
Reduced pricing for digital-only versions with limited-time access