Which mathematical algorithm is MOST commonly used as the foundation for e-commerce recommendation systems that suggest "Customers who bought this also bought..." products?

In today's digital marketplace, mathematics plays a crucial role in e-commerce platforms. Complex algorithms analyze user behavior, predict preferences, and optimize retail experiences. This poll explores how mathematical models have transformed online shopping and influenced product recommendations. Test your knowledge about the intersection of mathematical algorithms and modern e-commerce trends!

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Collaborative filtering with matrix factorization
Dijkstra's shortest path algorithm
Fourier transform analysis
Monte Carlo simulation