Logic Question – Bulbs

Answer: This requires a little thought. So, lets start by swicthing on one and leaving it on long enough for the bulb in the attic to get nice and hot. Switch it off and switch on one of the other two and immediately go upstairs. You should be able to identify which one is on, right? And between the other two, you know the hot one is the one you switched on first.

January 11, 2019