Three Plugs Puzzle Solution

Solution:

Plug in plug A for a few minutes, unplug.  Plug in plug B, leave it on and right away open the box.

If the lamp is on, plug B is the one that lights up the lamp.

If not, check if the bulb is hot.

  If the bulb is hot, then plug A is the one that lights up the lamp, if the bulb is cold, plug C is the one.

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