Which mathematical algorithm is most widely used by major e-commerce platforms for their product recommendation systems?

E-commerce platforms rely heavily on mathematical algorithms to enhance user experience. From product recommendations to pricing strategies, mathematics powers the digital shopping world. This poll tests your knowledge about how mathematical concepts are implemented in modern e-commerce platforms to optimize customer engagement and boost sales. Can you identify which mathematical approach is most commonly used for a key e-commerce function?

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Collaborative filtering using matrix factorization
Binary search trees for inventory management
Monte Carlo simulations for price optimization
Euclidean distance calculations in image recognition