The Switches (Part 1 and Part 2)

 Switches Part 1:-

Switch A turns lights 1 and 2 on/off or off/on
Switch B turns lights 2 and 4 on/off or off/on
Switch C turns lights 1 and 3 on/off or off/on

ON -indicates on

and 

OFF indicates off

Figure 1:-               Figure 2:-

1.ON                      1.OFF

2.OFF                     2.ON

3.OFF                     3.ON

4.ON                       4.OFF

Switches C, A and B are thrown in turn with the result that Figure 1 turns into
Figure 2. 

Which switch does not work at all?

Orientation:-

1)Apply switches in order C,A,B where each time you dont apply the switches for anyone of A,B,C and see if you are getting from Figure 1 to Figure 2.

2)This puzzle was taken from "The ultimate IQ test book : 1000 practice test questions to boost your brainpower" by  Philip Carter and Ken Russell

Switches Part 2:-

Switch A turns lights 1 and 2 on/off or off/on
Switch B turns lights 2 and 4 on/off or off/on
Switch C turns lights 1 and 3 on/off or off/on
Switch D turns lights 3 and 4 on/off or off/on

Figure 1:-              Figure 2:-

1.ON                      1.ON

2.ON                      2.ON

3.ON                      3.OFF 

4.ON                      4.OFF


Switches D, C, A and B are thrown in turn with the result that Figure 1 turns into
Figure 2. Which switch does not work at all?

Orientation:-

1)Apply switches in order D,C,A,B where each time you dont apply the switches for anyone of A,B,C,D and see if you are getting from Figure 1 to Figure 2.

2)This puzzle was taken from "The ultimate IQ test book : 1000 practice test questions to boost your brainpower" by  Philip Carter and Ken Russell


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