Which mathematical concept revolutionized e-commerce product recommendation systems in the early 2010s?

In the world of retail mathematics, algorithms and statistical models drive decision-making in unexpected ways. Consumer behavior can be predicted through complex mathematical models, and product success often depends on understanding the numbers behind marketing strategies. This poll tests your knowledge about how mathematical concepts influence modern retail marketing and advertising campaigns.

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Collaborative filtering matrix factorization
Euclidean distance clustering
Fibonacci sequence optimization
Bayesian probability networks