Susquehanna (SIG) Interview Questions
The real Susquehanna (SIG) quant-interview problems candidates report — probability, expected value and combinatorics — each with a full worked solution.
Inside the Susquehanna (SIG) interview
Susquehanna International Group (SIG) is a global options-trading and market-making firm whose interviews are built around decision-making under uncertainty. Expect rapid-fire probability, expected value, and game theory questions, often framed as bets you must price on the spot.
What they test
The dominant block is probability and expectation — conditional reasoning, coin-and-dice setups, and expected-value calculations you can do without a calculator. Around it sit combinatorics and game theory (optimal play, fair-bet pricing), plus a thread of options-pricing and market-microstructure questions that reflect SIG's market-making core. A smaller set of coding problems checks that you can turn the math into clean logic.
The recurring shapes
Many problems reduce to a fair-value question: compute the expected payoff of a game and decide what you'd pay to play. Others test states and transitions — waiting times for patterns, gambler's-ruin walks, and absorbing-state expectations. Combinatorial counting and symmetry arguments show up constantly for collapsing a messy sample space into a clean fraction.
How to approach
Practice fast mental arithmetic and learn to set up indicator variables and linearity of expectation so you can answer before the clock runs out. For the game-theory and options items, reason about the counterparty: what's the EV-neutral price, and where does the edge come from? State your assumptions out loud and quote a number with a margin, the way a market maker quotes a two-sided market.
The mix leans medium (63 medium, 27 easy, 10 hard), so it rewards fluency and speed over a few hard set-pieces.
Susquehanna (SIG) probability questions (37)
- Bold Betting to Five Tokens
- Probability Two Flowers Bloom at the Same Time
- Conditional Probability from a Profit Table
- Fake News Given Many Likes
- Will Two Muffins Be Enough?
- Which Cat Did I Pick, Given It Lost?
- Which Factory Made Both Widgets?
- Probability of a Pair in Poker
- Average of Three Numbers from 1 to 20
- Probability That the Median Exceeds a Threshold
- The Five-Dice Mahjong Game
- Smoker Mortality and Bayes' Theorem
- Will the Coin Land Inside One Square?
- Which Biased Coin Did I Flip, Given Tails?
- HHT Before THH in Coin Flips
- Acute Triangle from Random Points on a Circle
- Optimal Switching in the Two Envelope Problem
- Pattern Race: HTH vs HHT
- Matching Multiset of Three Dice Rolls
- Absolute Uniform Difference
- Meeting Probability for N Uniform Arrivals
- Catching the Bus in Time for the Movie
- Ten Dice With a Sum Divisible by Seven
- Divisibility of Dice Sums by 6 and 7
- Conditional Probability with Biased Coins
- Which Class Was the High-Scoring Test From?
- No Adjacent Heads in a Circle
- Probability of HTH Before HHT
- Bounding the Probability of Zero
- Casino Edge Over 10,000 Plays
- Gambler's Ruin on a Fair Coin
- Triangle Containing the Center of a Cube
- Pattern Race: HHT vs HTH
- Two Trips with At Least One International in December
- First-to-Roll-Six Dice Game
- Adjacent Acquaintances at a Round Table
- Bayes' Theorem: Condition Prevalence Among Smokers
Susquehanna (SIG) expected value questions (24)
- Expected Spins to Land in Two Distinct Regions
- Expected Number of Pairs in a Dealt Hand
- Expected Payout of the Higher of Two Dice
- Expected Return of a Three-Dice Game
- Expected Product of Two Dice
- Expected Payoff of a Recursive Die Game
- Cards Passed Around a Circle
- Expected Number of Card Recipients in a Circle
- Fair Value of Land with Uncertain Payoff
- Coin Reflip Option
- Expected Flips to See Tails-Then-Heads
- Four Heads Coin Toss Game
- Expected Sum of Four Bills
- St. Petersburg Paradox and Log Utility
- Fair Value of Land with Geologist Option
- Optimal Stopping: Three-Roll Dice Game
- Expected Chord Length Through a Disk (Random Radius Method)
- Card Betting: Higher or Lower
- Expected Flips for Consecutive Heads
- Expected Value of Bills Drawn Without Replacement
- Optimal Number of Auction Bidders
- Expected Adjacent Boy-Girl Pairs in a Random Line
- Expected Pizzas Eaten with Rerolling
- Defective Cat Plushie
Susquehanna (SIG) combinatorics questions (10)
- Lattice Paths With No Three Steps in a Row
- Arranging Cookies of Two Types
- Round Table Seating Puzzle
- Legs at the Party
- Battleship on a 4x4 Board: Arrangements and Optimal Targeting
- Anagrams With All B's Before the First O
- Scheduling Appointments with a Constraint
- Counting Wins in Rock-Paper-Scissors
- Elastic Collisions on a Frictionless Plane
- Jenga Stack
Susquehanna (SIG) coding questions (9)
- Matrix Cells Whose Row and Column Are Otherwise Constant
- Updatable Array with Pair-Sum Queries
- Matrix Manipulation Commands
- Odd-Length Strings Containing a Vowel
- Virtual Dispatch and Object Slicing in C++
- Shortest Subarray with Exactly K Distinct Values
- Order Book Data Structure and Arbitrage Detection
- Merge Sort: Correctness and Complexity
- Median from a Data Stream
Susquehanna (SIG) game theory questions (5)
Susquehanna (SIG) brain teasers questions (4)
Susquehanna (SIG) options pricing questions (3)
Susquehanna (SIG) stochastic processes questions (2)
Susquehanna (SIG) random variables questions (2)
Susquehanna (SIG) regression questions (1)
Susquehanna (SIG) statistics questions (1)
Susquehanna (SIG) market microstructure questions (1)
Susquehanna (SIG) finance questions (1)
Susquehanna (SIG) interview FAQ
What kind of questions does Susquehanna (SIG) ask in quant interviews?
Candidates most often report probability, expected value and combinatorics questions. This page collects 100 of them, 68 stamped with the month they were last reported — each with a full worked solution.
How hard are Susquehanna (SIG) interview questions?
The set spans 27 easy, 63 medium and 10 hard problems. Most sit at medium difficulty — solvable in a few minutes with clean reasoning — with a harder tail that rewards knowing the canonical tricks.
How do I prepare for the Susquehanna (SIG) quant interview?
Work through this set by topic (use the sidebar), starting from your weakest area. 17 problems are free to open with their full solution, so you can judge the quality before anything else. Then walk the full Susquehanna (SIG) interview guide for the round-by-round funnel and the online assessment.
Are these the actual Susquehanna (SIG) interview questions?
They are built from candidate-reported Susquehanna (SIG) questions. We rewrite each prompt for clarity and author the worked solutions ourselves — we don't claim the wording is verbatim, and we never invent questions or recycle generic lists. 68 of 100 carry the month they were last reported.