Quant interview prep, technique by technique.
Deep guides to the core techniques that show up in quant trading interviews. Each page covers when the technique appears, sample problems, solving strategies, and common variations interviewers use.
The single most common technique in quant interviews. Every problem reduces to it eventually.
If the problem has states and transitions, it's a Markov chain — and quant interviewers love them.
"Given X happened, what's the probability of Y?" — the second-most-common framing in quant interviews.
The machinery for updating beliefs. A staple of quant interviews, often in disguised form.
When to stop and take the offer — the secretary problem and its cousins.
E[X + Y] = E[X] + E[Y], independent or not. The most over-powered tool in probability.
"Let f(n) = expected…" — the universal technique for self-similar probability problems.
The problems that collapse in one line — if you notice the symmetry.
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