Would you get hired by a Private Equity firm?
This is a common brain teaser that a lot of PE candidates get tripped up on. Comment your answer before reading the solution.
⬇️ Solution
Split the balls into three groups: 3 / 3 / 2.
Weigh 3 vs 3.
If one side is heavier, the heavy ball is in that group.
→ Then weigh 1 vs 1 from the heavier group. If one is heavier, that’s your answer. If they balance, the third ball is heavier.
If the 3 vs 3 balances, the heavy ball is in the remaining 2.
→ Weigh them against each other.
Did you get it right? Any alternative solutions you can think of?
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