Quant Interview Training

Market Maker

Quote bid/ask spreads for mental arithmetic, Fermi estimates, and probability in 60 seconds. Tighter spreads earn more — but if the true answer is outside, the bot trades against you.

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Inside spread

You earn the spread. Tighter = more profit.

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True answer > ask

Bot buys (lifts your ask). You lose.

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True answer < bid

Bot sells (hits your bid). You lose.

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ARITHMETIC

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FERMI

PROBABILITY