Skip to main content
All Questions

You flip a fair coin until you see heads. How many flips do you expect to need?

Unlock detailed company stats for this questionUpgrade

Community answers

No answers contributed by the community yet.

Related questions

A fair coin is flipped repeatedly. How many flips do you expect to need before you see three heads in a row?You flip a fair coin three times. What's the expected number of heads?How many times must you flip a fair coin to have at least a 50% chance of having seen two consecutive heads?

Related courses

Course

SQL Interview Prep Course

Prepare for SQL interviews with lessons on joins, aggregations, and window functions, then practice real SQL interview questions in an interactive editor with expert solutions.

Course

Data Science Interview Prep

Land your dream data science role at Google, Amazon, Microsoft, Meta, Apple, and other top companies. Learn from mock interviews, frameworks, and advice from senior candidates. Practice statistics, experimentation, coding, SQL, machine learning, behavioral interviews, and more.