Question 1
7 people (Layla, Shweta, Hikari, Robert, Riley, Ritu, Robin) live on floors 1 to 7, one person per floor.
Based on these clues:
• Robin lives on the top floor
• Shweta lives on floor 6
• Layla lives on floor 5
• Ritu lives immediately below Robert
• Ritu lives on the bottom floor
• Riley lives on an even-numbered floor
On which floor does Hikari live?
The unique arrangement (floor: person) is: {1: 'Ritu', 2: 'Robert', 3: 'Hikari', 4: 'Riley', 5: 'Layla', 6: 'Shweta', 7: 'Robin'}.