Which mathematical algorithm did Khan Academy implement in 2019 to personalize learning paths, resulting in a 42% increase in student engagement and dramatically improving their e-commerce conversion rate?

In the world of mathematics-focused e-commerce, algorithms and data analytics drive customer experience optimization. This trivia question explores how one of the world's leading online mathematics learning platforms revolutionized its customer journey using an innovative approach to personalization. Test your knowledge about the intersection of mathematical principles and digital retail strategy!

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Bayesian Knowledge Tracing (BKT)
Monte Carlo Markov Chain (MCMC)
Gradient Descent Optimization (GDO)
Random Forest Decision Trees (RFDT)