Which mathematical concept is most commonly used by e-commerce algorithms to group customers with similar purchasing behaviors for targeted marketing campaigns?

In today's data-driven world, mathematics plays a crucial role in analyzing consumer behavior and optimizing marketing strategies. E-commerce platforms particularly rely on mathematical models to understand user preferences and predict future purchasing patterns. This poll tests your knowledge of how mathematics intersects with modern digital marketing analytics in the e-commerce space.

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Cluster Analysis (K-means, Hierarchical clustering)
Fourier Transforms
Differential Calculus
Euclidean Geometry