Question 1
Two parallel rows of chairs. Row 1 has E, C, A, B and D facing South.
Row 2 has Q, R, P, S and T facing North. Each person in one row faces exactly one person from the other row.
A sits fourth from the left end of Row 1. Q faces A.
E sits at an extreme end of Row 1. C sits second to the right of E.
R sits second to the left of Q. P sits at an extreme end of Row 2.
T is not adjacent to Q in Row 2.
Who faces C?
Solution Approach:
Step 1: Draw the double row setup
Row 1 faces South (↓), Row 2 faces North (↑)
Person at position i in Row 1 faces person at position i in Row 2.
Position: 1 2 3 4 5
Row 1 (↓): _ _ _ _ _
Row 2 (↑): _ _ _ _ _
Key direction rule:
- Row 1 (South-facing): "right" = viewer's LEFT (lower position numbers)
- Row 2 (North-facing): "right" = viewer's RIGHT (higher position numbers)
Step 2: Place Row 1 persons
- A sits 4th from the left end of Row 1 → Row 1, pos 4
- E sits at an extreme end: pos 1 or pos 5
- C sits second to the RIGHT of E (south-facing → lower position):
pos[C] = pos[E] - 2
If E at pos 1 → pos[C] = -1 (invalid ✗)
If E at pos 5 → pos[C] = 3 ✓ (pos 3 is free)
∴ E at pos 5, C at pos 3 ✓
Row 1: _ _ C A E
Remaining B,D at pos 1 and 2 (either order — pinned next).
Step 3: Place Row 2 persons
- Q faces A (pos 4) → Q at Row 2, pos 4
- R sits second to the LEFT of Q (north-facing → lower position):
pos[R] = pos[Q] - 2 = 2 → R at Row 2 pos 2 ✓
- P sits at extreme end of Row 2: pos 1 or pos 5
- T is NOT adjacent to Q (pos 4): adjacent = pos 3 and pos 5
So T ≠ pos 3 and T ≠ pos 5
Remaining positions for P,S,T: pos 1, pos 3, pos 5
T not at pos 3 or pos 5 → T at pos 1
P at extreme → pos 5 (since pos 1 is T) ✓
S fills pos 3 ✓
Row 2: T R S Q P
Final Arrangement:
Position: 1 2 3 4 5
Row 1 (↓): B/D B/D C A E
Row 2 (↑): T R S Q P
Find who faces C:
C is at Row 1, position 3.
Person at Row 2, position 3 = S
Answer: S faces C.
Step 1: Draw the double row setup
Row 1 faces South (↓), Row 2 faces North (↑)
Person at position i in Row 1 faces person at position i in Row 2.
Position: 1 2 3 4 5
Row 1 (↓): _ _ _ _ _
Row 2 (↑): _ _ _ _ _
Key direction rule:
- Row 1 (South-facing): "right" = viewer's LEFT (lower position numbers)
- Row 2 (North-facing): "right" = viewer's RIGHT (higher position numbers)
Step 2: Place Row 1 persons
- A sits 4th from the left end of Row 1 → Row 1, pos 4
- E sits at an extreme end: pos 1 or pos 5
- C sits second to the RIGHT of E (south-facing → lower position):
pos[C] = pos[E] - 2
If E at pos 1 → pos[C] = -1 (invalid ✗)
If E at pos 5 → pos[C] = 3 ✓ (pos 3 is free)
∴ E at pos 5, C at pos 3 ✓
Row 1: _ _ C A E
Remaining B,D at pos 1 and 2 (either order — pinned next).
Step 3: Place Row 2 persons
- Q faces A (pos 4) → Q at Row 2, pos 4
- R sits second to the LEFT of Q (north-facing → lower position):
pos[R] = pos[Q] - 2 = 2 → R at Row 2 pos 2 ✓
- P sits at extreme end of Row 2: pos 1 or pos 5
- T is NOT adjacent to Q (pos 4): adjacent = pos 3 and pos 5
So T ≠ pos 3 and T ≠ pos 5
Remaining positions for P,S,T: pos 1, pos 3, pos 5
T not at pos 3 or pos 5 → T at pos 1
P at extreme → pos 5 (since pos 1 is T) ✓
S fills pos 3 ✓
Row 2: T R S Q P
Final Arrangement:
Position: 1 2 3 4 5
Row 1 (↓): B/D B/D C A E
Row 2 (↑): T R S Q P
Find who faces C:
C is at Row 1, position 3.
Person at Row 2, position 3 = S
Answer: S faces C.