Which of the following must be false?
Explanation:
Since C and D cannot be together, they can occupy either of the following seats: (1st and 3rd), (1st and 4th) or (2nd and 4th). In the last two cases, since B cannot be in the 3rd place, A will have to be there.
Thus, we can see that A can never be in the 1st place.
Hence, statement (a) is false.
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