Insight Sourcing Group Interview Question: You have 9 marbles, 1 of whic... | Glassdoor

Interview Question

Business Analyst Interview(Student Candidate)

You have 9 marbles, 1 of which weighs more than the rest

 , and a two-way scale. How do you determine which is the odd marble in the fewest steps?

Interview Answer

1 Answer


It takes only 2 steps. First step, compare one group of 3 to another. If balance is the same, the 3 left out have the marble; if the balance dips, the marble is on the dipping side. Second step, of the group of 3 you have, weigh 2 against each other. Again, if it dips in one side, that is the odd marble; if the same, the one out is the odd marble.

Anon on Nov 9, 2017

Add Answers or Comments

To comment on this, Sign In or Sign Up.