Which mathematical concept formed the foundation of Amazon's original recommendation algorithm that helped them achieve a reported 35% increase in sales?

Test your knowledge about the mathematical algorithms that power major e-commerce platforms! Behind every product recommendation and personalized shopping experience lies sophisticated mathematics. This poll explores which mathematical concept revolutionized a major online retailer's recommendation system and significantly boosted their sales. Do you know which mathematical approach transformed how products are suggested to customers?

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Collaborative Filtering Matrix Factorization
Bayesian Neural Networks
Convolutional Deep Learning
Monte Carlo Markov Chain Simulation