Which subscription-based mathematics platform pioneered the 'pay-per-problem' model that dynamically adjusts pricing based on problem complexity using algorithmic difficulty scoring?

In recent years, subscription-based learning platforms have transformed how students and professionals access mathematical education resources. From advanced calculus tools to statistical analysis software, these platforms have created new business models in the mathematics education sector. This poll tests your knowledge about the intersection of subscription models and the mathematics industry.

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Wolfram Alpha Pro
MathGPT
Brilliant.org
EquationSolver Pro