Which innovative pricing model did Wolfram Alpha introduce for its computational mathematics engine that revolutionized how students access advanced math tools?

Product pricing in mathematics education tools involves complex strategies that balance market positioning, perceived value, and profit margins. Companies developing math education software, textbooks, and learning platforms must carefully consider their pricing approach to reach their target audience while maintaining profitability. This trivia question explores a notable pricing innovation in the mathematics education industry that disrupted traditional models.

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The 'Pro subscription' model with specialized tiers for different education levels
The 'Pay-per-equation' micropayment system where users pay only for specific calculations
The 'University consortium' model where institutions pay based on student enrollment numbers
The 'Freemium with step-by-step solution purchases' allowing free basic calculations with paid detailed solutions