Which pricing model innovation dramatically increased student access to professional-grade mathematics software during the 2010s?

The pricing of mathematical software has evolved significantly over the decades. From simple calculators to sophisticated statistical packages and computer algebra systems, pricing strategies have reflected both technological advances and changing consumer demands. This trivia question explores a key pricing innovation that revolutionized how students and educators access advanced mathematical tools.

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Freemium model with limited equation solving in free versions
Subscription-based licensing for academic institutions
Bundling software with textbook purchases
Pay-per-calculation pricing using cloud computing