Which subscription pricing strategy did the mathematics learning platform 'Brilliant.org' pioneer that led to a 40% increase in user retention?

Subscription-based learning platforms have revolutionized how mathematics education is delivered globally. These services use sophisticated algorithms to personalize learning experiences while maintaining profitable business models. This poll tests your knowledge about the intersection of mathematics education platforms and their subscription strategies in today's digital marketplace.

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Tiered proficiency pricing - where costs decrease as users solve more complex problems
Dynamic difficulty adjustment - where subscription costs correlate with personalized algorithm-determined learning paths
Annual subscription model with course persistence - allowing lifetime access to completed courses even after subscription ends
Collaborative discount scaling - where subscription prices decrease based on the number of users who solve problems together