Interview Questions

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548 companies
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Last updated Nov 2026

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Three contestants each pick a positive integer, and the smallest number picked by exactly one person wins a car. How should you choose your number?
15 hours ago
Describe linear regression in detail.
+115 hours ago
What is the expected value of the maximum of N independent normally distributed random variables?
15 hours ago
You regress Y on X, then append a copy of the data so the sample is twice as long and rerun the regression. How do the coefficient, its t-statistic and R^2 change?
+15 years ago
How would you build a model to predict housing prices in New York City?
10 months ago
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A 3x3x3 cube is painted red and cut into 27 unit cubes. One is picked at random and placed on a table, and its five visible faces are unpainted. What is the probability the hidden face is red?
15 hours ago
The three distinct entries of a 2 x 2 symmetric matrix are drawn independently from the uniform distribution on [-60, 60]. What is the expected determinant?
15 hours ago
Nine boys and seven girls sit at random around a circular table with 16 seats. What is the expected number of adjacent boy-girl pairs?
15 hours ago
Given an unsorted integer array that may contain duplicates and a target, find a pair of elements that sums to the target in O(N) time.
15 hours ago
Solve for x: (1/3)(x + 2) - 2 = 4.
15 hours ago
How does a Python list differ from a numpy array, how would you design a list type, and how would you implement a dictionary?
3 years ago
Implement depth-first search and breadth-first search.
15 hours ago
Prove Cantelli's inequality: if X has mean mu and variance sigma^2, then P(X - mu >= t) <= sigma^2 / (sigma^2 + t^2) for every t > 0.
2 years ago
A 10 x 10 x 10 cube has its outer layer of unit cubes removed. What are the dimensions of the remaining cube?
15 hours ago
Four fair coins pay $1 per head. You may re-flip all four once but must keep the second result. What is the game worth?
15 hours ago
Design a function that returns true for the first 20 calls within each one-second interval and false for the remaining calls in that interval.
15 hours ago
Without a calculator, turn 0.59 / 0.73 into a decimal.
15 hours ago
Each square of a chessboard holds a non-negative integer. Place two rooks that do not attack each other so that the sum of the two squares they occupy is as large as possible.
15 hours ago
Compare a numpy array with a Python list in terms of efficiency, initialisation and memory use.
15 hours ago
Implement the move logic of the game 2048: slide and merge the tiles of a grid in each of the four directions.
5 years ago

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Interview Questions

Three contestants each pick a positive integer, and the smallest number picked by exactly one person wins a car. How should you choose your number?

Describe linear regression in detail.

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

You regress Y on X, then append a copy of the data so the sample is twice as long and rerun the regression. How do the coefficient, its t-statistic and R^2 change?

How would you build a model to predict housing prices in New York City?

A 3x3x3 cube is painted red and cut into 27 unit cubes. One is picked at random and placed on a table, and its five visible faces are unpainted. What is the probability the hidden face is red?

The three distinct entries of a 2 x 2 symmetric matrix are drawn independently from the uniform distribution on [-60, 60]. What is the expected determinant?

Nine boys and seven girls sit at random around a circular table with 16 seats. What is the expected number of adjacent boy-girl pairs?

Given an unsorted integer array that may contain duplicates and a target, find a pair of elements that sums to the target in O(N) time.

Solve for x: (1/3)(x + 2) - 2 = 4.

How does a Python list differ from a numpy array, how would you design a list type, and how would you implement a dictionary?

Implement depth-first search and breadth-first search.

Prove Cantelli's inequality: if X has mean mu and variance sigma^2, then P(X - mu >= t) <= sigma^2 / (sigma^2 + t^2) for every t > 0.

A 10 x 10 x 10 cube has its outer layer of unit cubes removed. What are the dimensions of the remaining cube?

Four fair coins pay $1 per head. You may re-flip all four once but must keep the second result. What is the game worth?

Design a function that returns true for the first 20 calls within each one-second interval and false for the remaining calls in that interval.

Without a calculator, turn 0.59 / 0.73 into a decimal.

Each square of a chessboard holds a non-negative integer. Place two rooks that do not attack each other so that the sum of the two squares they occupy is as large as possible.

Compare a numpy array with a Python list in terms of efficiency, initialisation and memory use.

Implement the move logic of the game 2048: slide and merge the tiles of a grid in each of the four directions.

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