Which mathematical technique forms the foundation of most modern product recommendation algorithms used by major e-commerce platforms?

In today's digital retail environment, personalized product recommendations drive significant revenue growth. Behind these recommendations are sophisticated mathematical models analyzing consumer behavior. This trivia question explores the mathematical foundations that power the recommendation engines you encounter daily on shopping platforms. Test your knowledge of how math shapes the modern shopping experience!

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Matrix factorization for collaborative filtering
Bayesian probability networks
Markov decision processes
Euclidean distance clustering