Which mathematical technique is MOST commonly used by e-commerce platforms to create personalized product recommendations based on past user behavior?

In today's data-driven retail world, mathematics plays a crucial role in e-commerce decision making. Advanced algorithms and statistical models power everything from pricing strategies to customer behavior predictions. This poll tests your knowledge about how mathematical models are specifically applied in modern e-commerce platforms to optimize business outcomes and enhance user experience.

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Collaborative filtering algorithms
Euclidean geometry
Monte Carlo integration
Fourier transform analysis