Which subscription-based mathematics learning platform pioneered the 'adaptive learning algorithm' that dynamically adjusts problem difficulty based on individual student performance?

The mathematics education industry has undergone significant changes in how content is delivered and monetized. Subscription-based learning platforms have transformed how students access mathematical knowledge, practice problems, and receive tutoring. This poll tests your knowledge of how subscription models have impacted the mathematics education marketplace and changed consumer behavior in this specialized sector.

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Khan Academy Plus
ALEKS (Assessment and Learning in Knowledge Spaces)
Brilliant.org
Mathway Premium