Brain Teasers & Mental Math

Percentage shortcuts, multiplication and division tricks, basis point conversions, the Rule of 72, and worked practice problems to build speed and confidence under interview pressure.

Core probability rules, expected value, conditional probability, Bayes' theorem, the Monty Hall problem, combinatorics, and over ten fully worked interview-style questions.

The two egg problem, Fermi estimation, market sizing, burning ropes, weighted balls, light switches, water jugs, and a framework for tackling any puzzle under interview pressure.