Slide 54
Slide 54 text
June 1, 2021
Solution:
Let the fans be X, Y, and Z
Turn on switch X for 5 to 10 minutes.
Turn it off and turn on switch Y. Open the
door and watch the fans -
1. the fan which is on, it is Y
Now we will check the other two off fans
2. the fan which is slowing down, it is X
3. the fan which is idle, it is Z
Door
There is a room with a door (closed) and three
fans. Outside the room, there are three
switches, connected to each fan. You may
manipulate the switches as you wish, but once
you open the door you can’t change them.
Identify each switch with its fan. All fans are in
working condition.
Room