Which mathematical technique revolutionized e-commerce product recommendations and is credited with generating 35% of Amazon's revenue according to industry analyses?

In the world of online retail, mathematical algorithms have transformed how companies analyze consumer behavior and optimize their operations. Advanced statistical models and machine learning techniques have become essential tools for e-commerce success. This trivia question focuses on a pivotal mathematical innovation that revolutionized product recommendations and personalization in the digital marketplace.

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Collaborative filtering using matrix factorization
Bayesian probability networks for purchase prediction
Monte Carlo simulations of customer behavior
Markov chain analysis for shopping cart optimization