Question 1

If N people each put their hat in a room and then each randomly pick one hat, what is the probability that a given person gets their own hat back?

Accepted Answer

This is a real Citadel Securities interview question for Quant Research Intern roles. Get the full solution and detailed walkthrough by signing up for Quant Blueprint's interview preparation program.

Question 2

Derive and explain the concept of put-call parity in options pricing.

Accepted Answer

This is a real Citadel Securities interview question for Quant Research Intern roles. Get the full solution and detailed walkthrough by signing up for Quant Blueprint's interview preparation program.

Question 3

Given n random variables from the same distribution, where the correlation between each pair of two variables is the same, what is the range of possible values for the correlation?

Accepted Answer

This is a real Citadel Securities interview question for Quant Research Intern roles. Get the full solution and detailed walkthrough by signing up for Quant Blueprint's interview preparation program.

Question 4

How can you implement a rolling mean and variance of a data stream in O(1) time per update?

Accepted Answer

This is a real Citadel Securities interview question for Quantitative Researcher Intern roles. Get the full solution and detailed walkthrough by signing up for Quant Blueprint's interview preparation program.

Question 5

What is the expected value of the maximum among N normally distributed random variables?

Accepted Answer

This is a real Citadel Securities interview question for Quantitative Researcher Intern roles. Get the full solution and detailed walkthrough by signing up for Quant Blueprint's interview preparation program.

Question 6

Given a number, determine whether it can be represented as the sum of two or more consecutive integers.

Accepted Answer

This is a real Citadel Securities interview question for Quantitative Researcher (Intern) roles. Get the full solution and detailed walkthrough by signing up for Quant Blueprint's interview preparation program.

Question 7

How do you implement a rolling mean and variance for a data stream in O(1) time per update?

Accepted Answer

This is a real Citadel Securities interview question for Quantitative Researcher Intern roles. Get the full solution and detailed walkthrough by signing up for Quant Blueprint's interview preparation program.

Question 8

What is the expected value of the maximum of N independent normally distributed variables?

Accepted Answer

This is a real Citadel Securities interview question for Quantitative Researcher Intern roles. Get the full solution and detailed walkthrough by signing up for Quant Blueprint's interview preparation program.

Citadel Securities Interview Questions

Want the full solutions?