Which mathematical algorithm did Amazon first use as the foundation of its revolutionary product recommendation system that significantly boosted its sales?

Modern retail has been transformed by mathematical algorithms that personalize shopping experiences. Behind the scenes, complex formulas determine everything from product recommendations to pricing strategies. This poll tests your knowledge of how one of the world's largest online retailers leverages mathematical innovation to create personalized shopping experiences that seem almost prescient in their accuracy.

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Collaborative Filtering
Random Forest Classification
Neural Network Deep Learning
Bayesian Probability Networks