Which mathematics subscription platform was the first to implement an adaptive learning algorithm that tailors problem difficulty based on individual student performance?

The world of mathematics education has been transformed by subscription-based learning platforms. These platforms have revolutionized how students and professionals access mathematical content, practice problems, and receive personalized instruction. But how well do you know the history and impact of these subscription models in mathematics education? Test your knowledge about how these platforms have changed accessibility, engagement, and learning outcomes in the field of mathematics.

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Khan Academy (2006)
ALEKS by McGraw-Hill (1994)
Brilliant.org (2012)
Mathway (2008)