Which mathematical technique forms the foundation of many modern retail recommendation systems used by companies like Amazon and Netflix?

Recommendation systems power many of our digital experiences, from online shopping to content streaming. In the field of mathematics, sophisticated algorithms determine which products or content you see next. These systems analyze patterns, preferences, and behaviors to create personalized experiences. But do you know which mathematical foundation underlies many of today's most powerful recommendation engines? Test your knowledge of the intersection between mathematics and retail recommendation systems!

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Matrix Factorization
Euler's Identity
Fibonacci Sequence Analysis
Gaussian Elimination