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. Which of the following must be false?
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. Which of the following must be false?
Select an option to attempt
Correct Answer: Option B
Explanation
Seating constraint analysis: C and D cannot be adjacent; B cannot be in position 3. Positions: 1-2-3-4. Testing 'A is at position 1': remaining seats 2, 3, 4 for B, C, D. B cannot be at 3 → B is at 2 or 4. If B=2: C and D at 3 and 4 — adjacent (positions 3-4 are adjacent) → VIOLATES C-D rule. If B=4: C and D at 2 and 3 — adjacent → VIOLATES C-D rule. In EVERY arrangement with A at position 1, C and D must be placed in adjacent positions (3,4 or 2,3). Therefore 'A is at the first place' MUST be FALSE under the given constraints.