Master the Quant Interview with Real Questions
Stop guessing what they'll ask. Practice with 500+ verified interview questions from Jane Street, Citadel, HRT, and other top firms.
Why Practice with Cracked?
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Every question in our database has been reported by a candidate who interviewed at a top firm in the last 12 months.
Detailed Solutions
Don't just get the answer. Understand the derivation, the intuition, and the "gotchas" that interviewers are looking for.
Language Independent
Practice coding problems in Python or C++. Our solutions cover optimal approaches for both languages, focusing on time complexity.
Practice by Category
Master specific question types to build a well-rounded skillset.
Expected value, conditional probability, Markov chains, and dice games.
Logic puzzles, pattern recognition, and lateral thinking problems.
Order book dynamics, betting sizing, and identifying arbitrage.
Dynamic programming, graph theory, sliding window, and heaps.
Sample Question of the Week
Can you solve this classic probability question from Jane Street?
The HHT vs HTH Coin Flip
You flip a fair coin repeatedly. You want to see the sequence Heads-Heads-Tails (HHT). Your opponent wants to see Heads-Tails-Heads (HTH). Who is more likely to win, and what is the probability?
Show Solution
Answer: HHT wins with probability 2/3.
Let's analyze the winning conditions. For HTH to appear, you need the sequence HT. However, if HH appears first, you are now waiting for T to complete HHT. Once HH appears, it is impossible for HTH to appear before HHT, because HTH requires a T after the first H, but we already have HH.
The only way HTH wins is if the sequence starts with HT... and eventually hits H without seeing HH first. Actually, a simpler way to see this is using a state machine or the Penney's Game formula. Expected wait time for HHT is 8. Expected wait time for HTH is 10. Wait, Penney's Game rules are non-transitive. Let's look at the prefix.
Winning prob for A (HHT) vs B (HTH):
If we see T first, we are back to start.
If we see HH, A wins effectively (guaranteed).
If we see HT, we are on track for B.
Detailed derivation available in the full course.
Frequently Asked Questions
Yes. We aggregate questions from recent interview candidates at firms like Jane Street, Citadel, and HRT. We verify them against our internal database of known question types.
For Quant Developer roles, C++ is often required or strongly preferred. For Quant Trader roles, Python is usually sufficient, but C++ familiarity is a bonus. Our platform supports both.
We categorize questions into Easy (sanity checks), Medium (standard interview level), and Hard (competitive/final round). We recommend starting with Medium.
Yes! We have a 'Fundamentals' track designed for those new to quantitative finance. It covers the basic probability and statistics concepts you need before tackling harder problems.