Which mathematical concept forms the foundation of Amazon's original product recommendation algorithm that helped transform e-commerce?

The retail industry has been transformed by mathematical algorithms and computational models. Companies use complex formulas to personalize shopping experiences and predict consumer behavior. This trivia question explores how one major e-commerce giant leveraged mathematical principles to revolutionize product recommendations and dramatically increase sales through data-driven decision making.

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Collaborative filtering matrices
Bayesian probability networks
Neural network deep learning
Markov chain decision processes