PUZZLE SOLVE

[clash]

You are standing in a room with three switches: A, B, and C.
In another closed room, there is one light bulb. You cannot see the bulb from the switch room.
You may enter the bulb room only once. Once you enter, you cannot go back to the switch room.
Question:
How can you determine which switch controls the light bulb?

 

[subsar]

You are standing in a room with three switches: A, B, and C.
In another closed room, there is one light bulb. You cannot see the bulb from the switch room.
You may enter the bulb room only once. Once you enter, you cannot go back to the switch room.
Question:
How can you determine which switch controls the light bulb?

• Turn on Switch A and leave it on for about 5 to 10 minutes.
• Turn off Switch A after the time has passed, and immediately turn on Switch B.
• Leave Switch C off the entire time.
• Enter the bulb room right away.
• Once inside the room, observe and carefully touch the light bulb
• If the bulb is ON: Switch B controls it, because it is the only one currently active.
• If the bulb is OFF but HOT: Switch A controls it, as it had time to warm up before you turned it off.
• If the bulb is OFF and COLD: Switch C controls it, since it was never turned on.