A, B, C and D are to be seated in a row. But C and D cannot be together. Also B cannot be at the third place.
If A and B are together, then which of the following must be necessarily true?
If A and B are together, then it can't be at first and second place as C and D will be together which is not possible.
Now if A can be at third place and B is at second place then C and D can be placed accordingly.
Answer will be B).
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