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From time to time we like to share a really tough riddle with all of you, and this one captured our attention recently.
It managed to divide everyone in our office as we argued over how to solve it, but we promise there is an answer, and it can be solved.
Here’s the brain teaser:
“Mr. Bright was doing some renovations on his home when he ran into an unusual problem.
Like a lot of renovation problems, it involved his home’s faulty wiring.
In Mr. Bright’s basement, there was a set of light switches.
A note from the home’s former owner explains that the three light switches are connected to three different light bulbs in the house’s attic.
Mr. Bright can’t see which light bulb turns on in the attic when he flips a switch in the basement.
While each switch is connected to just one light bulb, all three light bulbs and switches look exactly the same.
Because Mr. Bright is getting older, he doesn’t want to walk back up and down his stairs. He will flip as many switches as he needs to, then walk upstairs just once to identify how the switches and light bulbs are connected.
To be clear, there’s no way to turn the lights on or off once Mr. Bright walks out of the basement to check on them.
And no, Mr. Bright can’t use a dimmer switch, or ask someone else to help him.
So here’s the puzzle: how can Mr. Bright identify all three switches and lights in just one trip from the basement to the attic?
Take a guess, then see if you were right on the next page.
Did you get a flash of inspiration, or are you still in the dark?
Don’t feel like a dim bulb if you’re struggling, here’s one more clue.
Mr. Bright flips two switches, then flips one off again.
Did you find the solution?