Solution:
- Keep the first bulb (A, say) switched on for a few minutes. This will warm the bulb.
- Switch the first bulb off, switch another one (B, say) on, go outside to the room where bulbs are place by keeping this bulb (B) on.
- Where you reach to the bulbs, you’ll find that one bulb is lightened up while two others are switched off. Touch both switched-off bulbs and notice which one of them is warm. Using this method you find, bulb A & bulb B and their corresponding switches.
- Remaining one-switch must correspond to third bulb.
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you turn switch number 1 on and leave it on for a few minutes, then turn it off. Then flip # 2 on, and leave 3 off. Exit the room to see the bulbs. The light that is on is switch # 2. The light that is off, but warm, is switch #1. The one that is off and not warm, is #3.
Good puzzle. It took me a few minutes.
You made it right. Thank you!