The are three switches (1, 2 and 3) and four lights (A, B, C and D). Each switch turns on exactly two lights and no two switches turn on identical lights. You know that
- Lights A, B and C are on when switches 1 and 2 are down.
- Lights A, C and D are on when switches 1 and 3 are down.
- Lights B, C and D are on when switches 2 and 3 are down.
Can you figure out which switch controls which lights? Good luck!