Which mathematical innovation has most revolutionized e-commerce personalization in the past decade?

E-commerce platforms rely heavily on mathematical algorithms to enhance customer experience. These algorithms power recommendation systems, optimize inventory, and create personalized shopping experiences. In recent years, one mathematical innovation has significantly transformed how online retailers understand and predict customer behavior, leading to dramatic improvements in sales and customer satisfaction. Test your knowledge of how mathematics drives retail innovation in this challenging trivia question!

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Collaborative filtering algorithms using matrix factorization
Simplex method for linear programming in inventory management
Bayesian inference models for A/B testing
Monte Carlo simulation for supply chain optimization