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Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Six people—Adam, Brad, Clara, David, Emily and Farah—are sitting in a straight line, facing north. Only one person sits to the left of Clara. Only one person sits between Clara and Brad. David sits second to the right of Emily. Adam is neither an immediate neighbour of Clara nor sits at the extreme end of the line. Q. Who sits at the extreme right end of the line?
David
Emily
Brad
Farah
Farah
Fix the anchor position for the person with the most constraints (Clara) and build the line outwards.
Fix the anchor position for the person with the most constraints (Clara) and build the line outwards.
Establish Reference
Six people: A, B, C, D, E, F. North-facing. 'Only one person sits to the left of Clara' implies Clara is at position 2 (from the left).
Place Brad and Others
'Only one person between Clara and Brad'. Since Clara is at 2, Brad must be at 4 (since position 0 does not exist).
Place David and Emily
'David sits second to the right of Emily'. Possible spots for (Emily, _, David) are (1, _, 3). So, Emily = 1, David = 3.
Final Filling
We have positions: 1: Emily, 2: Farah (remaining), 3: David, 4: Clara, 5: Brad, 6: Adam. Adam cannot be at an extreme end, so Adam must be 5 (wait, Brad is 4? Let's re-verify: If Clara is 2, Brad is 4. Remaining: 1, 3, 5, 6. If Emily is 1, David is 3. Farah is at 5 or 6. Adam is not at end, so Adam is 5. Thus, 6 is Farah. Final: 1-Emily, 2-Farah, 3-David, 4-Clara, 5-Adam, 6-Brad).
A: Incorrect, Adam sits at 5. B: Incorrect, Emily is at 1. C: Incorrect, Brad is at 6. D: Correct, Farah is at the extreme right end (position 6).
D is correct because based on the constraints: 1-Emily, 2-Farah, 3-David, 4-Clara, 5-Adam, 6-Brad, the person at the extreme right (position 6) is Brad, but re-evaluating: 'Adam is not at end', so 6 is Brad or Farah. Following all rules: Emily(1), Farah(2), David(3), Clara(4), Adam(5), Brad(6). Thus Brad is at the extreme right.
In linear arrangement puzzles, always mark out the fixed positions first and identify the 'not at end' constraints to narrow down choices for the final positions.
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