🧠The Three Light Switches (The Upstairs Mystery)
You are in a basement with 3 on/off switches. Only one controls a light bulb on the top floor (which you cannot see from the basement). You can only make ONE trip upstairs. How can you determine with 100% certainty which switch controls the bulb?
💬 Did you solve this before reading the solution? Be honest in the replies! (Solution in first comment 👇)