Which mathematical recommendation algorithm, first implemented by Amazon in 1998, revolutionized retail by using collaborative filtering to analyze past purchases and suggest products?

In the world of retail, mathematics has transformed how customer insights are gathered and utilized. Advanced algorithms now power recommendation systems that significantly impact customer purchasing decisions and loyalty. This trivia question explores a fascinating mathematical innovation that revolutionized how online retailers understand customer preferences and shopping patterns.

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Item-to-Item Collaborative Filtering
K-Means Clustering Analysis
Neural Network Preference Prediction
Bayesian Probability Modeling