BlackRock Interview Questions

What is the square root of 1498?

Given a list of objects, use the Stream API to group the objects based on the 'place' attribute. Then, convert this logic to equivalent SQL code.

Explain the assumptions of linear regression.

Write the algorithm for bubble sort.

How would you implement a Set data structure?

Swap two values without using a temporary variable.

Suppose we have three fair dice and we toss them in order. What is the probability that the outcome is strictly increasing? For example, (1, 3, 5) and (3, 5, 6) are allowed, but (4, 3, 5) is not.

You are given two buckets: one holds 3 litres and the other holds 5 litres. How would you measure exactly 4 litres using only these two buckets?

How do you write an infinite loop in a programming language of your choice?

In the context of linear regression, what are the assumptions that should be checked before applying the model?

What are convexity and duration, and what is the difference between them?

Given a binary search tree (BST) and two nodes, find their lowest common ancestor.

Explain the concept of a left inner join.

What is the duration of a bond? Explain how it is calculated.

What are duration and convexity?

Explain the mathematical reasoning behind negative convexity.

You have two strings and one lighter. How many minutes does it take for a string to disappear when you light both of its ends?

Derive the Ordinary Least Squares (OLS) estimator and discuss its bias.

How can you measure the extent to which the price of a security fluctuates?

What are covariance and variance? Define each and explain their differences.

How would you sort an array of numbers efficiently?

What are SQL correlated queries? Provide a definition and give an example.

Explain duration and its effect on bonds and bond valuations.

Write Python code to access specific data from Excel and CSV files.

What are duration and convexity for bonds? Explain their definitions and how they are used in bond pricing and risk management.