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Question 19
Q: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 Switches B, D, A and C are thrown in turn with the result that Figure 1 turns into Figure 2. Which switch does not work at all?
Question 20
Q:How many minutes is it before 12 noon if 16 minutes ago it was three times as many minutes after 9 am?
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Question 21
Q:To which hexagon below can a dot be added so that it then meets the same conditions as in the hexagon above?
Question 22
Q: is to: as is to:
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Question 23
Q: is to: as is to:
Question 24
Q:When the above is folded to form a cube, which is the only one of the following that can be produced?
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