Which mathematical concept forms the foundation of recommendation algorithms used by major online retailers like Amazon to suggest 'Customers who bought this also bought...' products?

The retail industry increasingly relies on advanced mathematical models to drive success. From inventory optimization to store layouts, mathematics plays a crucial role in modern retail. This poll tests your knowledge about how mathematical concepts are applied in retail digital transformation to improve business outcomes. Can you identify which mathematical approach has revolutionized personalized product recommendations?

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Collaborative filtering using matrix factorization techniques
Simple geometric mean calculations of purchase history
Basic arithmetic progression based on price points
Pythagorean theorem applied to customer segments