< LABS
PROB12
12 GAMES · GAMBLER'S RUIN · MARKOV CHAINS · COUNTING · EVENT HORIZON · CONDITIONAL PROBABILITY · EV · TIMED · SCORED 12 GAMES · GAMBLER'S RUIN · MARKOV CHAINS · COUNTING · EVENT HORIZON · CONDITIONAL PROBABILITY · EV · TIMED · SCORED
000
ACC --
LAB 01 · PROBABILITY
Probability practice for quant interviews
Expected value, conditional probability and gambler's ruin - what Jane Street, SIG and Optiver screen first.
TICKETS
0ACCURACY
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SIMULATION
SKILL
GAMES
YOUR HI
LAST 8
01
Quitters Never LoseGambler's ruin, played out: pick a game, watch what a bankroll does over a long session, and see the ruin probability in real time
GAMBLER'S
RUIN
RUIN
8
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NOT PLAYED
02
Ruin WalkerA Markov chain with an absorbing state: choose small steps or volatile jumps, then decide when to stop before the walk hits ruin
MARKOV
CHAINS
CHAINS
1
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NOT PLAYED
03
Space ShiftCards, marbles, dice and tickets drawn two at a time: build the sample space grid, light the event, then answer the probability
COUNTING
PAIRS
PAIRS
1
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NOT PLAYED
04
Deep ShiftBinomials, poker hands, Bayes, first success and the normal curve, with a confidence call on every answer
BAYES
BINOMIAL
BINOMIAL
1
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NOT PLAYED
05
Event HorizonTwelve star sectors covering the full exam surface: stopping rules, indicators, variance, inclusion-exclusion, hypergeometric and proofs
EXAM
MASTERY
MASTERY
12
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NOT PLAYED
NO GRADED ANSWERS YET - PLAY A ROUND TO SEE WHERE YOU LEAK> PICK A GAME
What the probability games train
Blackjack
Real 4-deck blackjack with live exact bust probabilities and a Hi-Lo counting check under a pit-boss timer. Read the Blackjack guide.
Russian Roulette
A shrinking elimination wheel where every safe spin compounds a 97%-of-fair multiplier and every wrong answer marks another losing number. Read the Russian Roulette guide.
Pick 3
A real Pick 3 lottery ticket where every play type - Straight, Box, Pair - carries the identical 50% house edge. Read the Pick 3 guide.
Scratch-Off (Timed, 7 Questions)
Scratch tickets with the odds printed face-up: 7 probability questions per ticket on a 5:15 clock, then a buy-or-walk decision. Read the Scratch-Off (Timed, 7 Questions) guide.