Which mathematical technique is most commonly used by major retailers for customer segmentation and personalized product recommendations?

Modern retail strategies increasingly rely on sophisticated mathematical models for optimization and prediction. These mathematical approaches help retailers make data-driven decisions about inventory management, customer segmentation, pricing strategies, and more. This trivia question explores how specific mathematical concepts are applied to solve complex retail problems and drive competitive advantage in today's market.

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K-means clustering and collaborative filtering
Differential equations and Fourier transforms
Bayesian inference and Markov decision processes
Linear programming and simplex method