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You left out the most important parts of the riddle. The way the question

is worded, all you have to do is turn one switch on, walk over to where the

fan and the bulbs are, see which one is on, mark the switch, and do that

two times.

The way the riddle works: The switches are on the ground floor of the house,

and the bulbs and the fan are on the 3rd floor. Now, how do you figure out

which switch controls what, without climbing the stairs more than once ?

-- Stand by the switches. Turn 2 of them ON. Wait 15 minutes.

Then turn one of the 2 OFF, and turn the 3rd one ON.

Then run upstairs and see what you have there.

-- Whatever is OFF ... either the fan or 1 bulb ... belongs to the switch that's OFF.

Now you only have to associate the 2 remaining switches with the 2 remaining items.

-- If 2 bulbs are ON, then they belong to the 2 switches that are ON.

One bulb is cool, and the other one is warm.

-- If only 1 bulb is ON, then it's either cool or warm.

-- A warm bulb that's ON belongs to a switch that was ON for 15 minutes

before you ran upstairs.

-- A cool bulb that's ON belongs to the switch that you turned ON

just before you ran upstairs.

You have identified all 3 switches with only one trip up the stairs.

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11y ago

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