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An electrical circuit for a set of 4 lights depends on a system of switches A, B, C and D. When these switches work they have the following effect on the lights: They each
change the state of two lights (i.e. on becomes off and off becomes on). The lights that each switch controls are as follows.

In configuration 1 shown below, switches CBDA are activated in turn, resulting in configuration 2. One switch did not work and had no effect at all. Which was that switch?

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a

A

b

B

c

C

d

D

answer is C.

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An electrical circuit for a set of 4 lights depends on a system of switches A, B, C and D. When these switches work they have the following effect on the lights: They eachchange the state of two lights (i.e. on becomes off and off becomes on). The lights that each switch controls are as follows. In configuration 1 shown below, switches CBDA are activated in turn, resulting in configuration 2. One switch did not work and had no effect at all. Which was that switch?