Which mathematical concept powers Amazon's recommendation engine that generates approximately 35% of their revenue?

Modern retail experiences are increasingly powered by sophisticated mathematical algorithms. From personalized recommendations to inventory optimization, mathematics drives the digital transformation of retail. This trivia question explores how a specific mathematical concept revolutionized online shopping experiences and customer recommendations, creating a multi-billion dollar industry impact.

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Collaborative Filtering Matrix Factorization
Bayesian Probability Networks
Neural Tensor Networks
Markov Decision Processes