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10,160 quantitativ interview questions shared by candidates

The example sequence 011212201220200112 ... is constructed as follows: 1. The first element in the sequence is 0. 2. For each iteration, repeat the following action: take a copy of the entire current sequence, replace 0 with 1, 1 with 2, and 2 with 0, and place it at the end of the current sequence. E.g. 0 -> 01 -> 0112 -> 01121220 -> ... Create an algorithm which determines what number is at the Nth position in the sequence (using 0-based indexing).
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Quantitative Researcher

Interviewed at BlackRock

3.7★
Sep 16, 2025

The example sequence 011212201220200112 ... is constructed as follows: 1. The first element in the sequence is 0. 2. For each iteration, repeat the following action: take a copy of the entire current sequence, replace 0 with 1, 1 with 2, and 2 with 0, and place it at the end of the current sequence. E.g. 0 -> 01 -> 0112 -> 01121220 -> ... Create an algorithm which determines what number is at the Nth position in the sequence (using 0-based indexing).

What is a martingale and why it is the building block in finance. Why the Brownian Motion is so important in finance and what are its characteristics. Write down an algorithm for computing the the square root of a number. Differences between Python and C++
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Quantitative Analyst

Interviewed at Citi

3.6★
Mar 22, 2021

What is a martingale and why it is the building block in finance. Why the Brownian Motion is so important in finance and what are its characteristics. Write down an algorithm for computing the the square root of a number. Differences between Python and C++

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