Directions: Read the following details carefully to answer the question that follows.
Eight colleagues, P, Q, R, S, T, U, V, and W, are sitting around a circular conference table, all facing towards the center. T sits to the immediate left of S. Only two people sit between T and Q. P sits second to the right of Q. U sits adjacent to both P and Q. V sits opposite to T. R sits adjacent to V but does not sit adjacent to Q. W sits between R and S.
If all the colleagues are arranged in alphabetical order starting from P in the anti-clockwise direction, then the position of how many colleagues will remain unchanged (excluding P)?Correct Answer :
None
Solution :
The correct answer is None.
Step-by-Step Explanation:
1. Analyze the given sitting arrangement:
Eight colleagues (P, Q, R, S, T, U, V, and W) are sitting around a circular table facing towards the center.
Let us determine their positions step-by-step in a clockwise direction:
- "T sits to the immediate left of S."
If we place S at position 1, T (being to the immediate left of S facing center) is at position 8 (or immediately counter-clockwise from S).
- "W sits between R and S."
Since T is to the immediate left of S, W must be to the immediate right of S (position 2), and R is next to W (position 3).
- "V sits opposite to T."
Since there are 8 positions, the position opposite to T (position 8) is position 4. So, V is at position 4.
- "R sits adjacent to V but does not sit adjacent to Q."
Position 3 is R, which is adjacent to V (position 4).
- "P sits second to the right of Q" and "Only two people sit between T and Q."
Going clockwise from T (position 8): positions 1 (S), 2 (W), 3 (R), 4 (V), 5 (P), 6 (U), 7 (Q).
Let us verify: Between T (position 8) and Q (position 7), going counter-clockwise or clockwise gives two people (V, P when looking counter-clockwise/clockwise spacing).
"U sits adjacent to both P and Q": Position 6 is U, which is between P (position 5) and Q (position 7).
"P sits second to the right of Q": Facing center, from Q (position 7), moving two places clockwise gives position 1 (S)? No, right of Q facing center is moving counter-clockwise (towards position 6, 5). So 2nd to the right of Q is position 5 (P). This perfectly aligns!
So, moving in a clockwise direction around the circle, the arrangement of people is:
S → W → R → V → P → U → Q → T
Going in anti-clockwise direction starting from P:
Original arrangement (anti-clockwise from P):
1. P
2. V
3. R
4. W
5. S
6. T
7. Q
8. U
2. Rearrange all colleagues in alphabetical order starting from P in the anti-clockwise direction:
Alphabetical order starting from P:
1. P
2. Q
3. R
4. S
5. T
6. U
7. V
8. W
3. Compare positions (excluding P):
- Position 2: V vs Q (Changed)
- Position 3: R vs R (Wait, let's re-verify the anti-clockwise vs clockwise definition):
Let's check positions carefully:
If S is at 12 o'clock:
- Facing center, immediate left of S is 1:30 position (T).
- W is between R and S, so W is at 10:30, R is at 9:00.
- V is opposite T (1:30), so V is at 7:30.
- R (9:00) is adjacent to V (7:30).
- Q is two people away from T. Opposite Q is 1:30? If Q is at 4:30, then between T (1:30) and Q (4:30) going clockwise there are 2 seats (3:00, 4:30? No, 3:00 is one seat). The seats are: 12:00 (S), 1:30 (T), 3:00 (Q? 2 seats between T and Q: 3:00, 4:30 -> Q at 6:00. Then opposite S is 6:00).
Let's list the 8 seats (1 to 8 clockwise):
Seat 1: S
Seat 8: T (immediate left of S)
Seat 2: W (W between R and S)
Seat 3: R
Seat 4: V (opposite T, which is seat 8: 8 - 4 = 4)
Seat 5: P
Seat 6: U (adjacent to P and Q)
Seat 7: Q
Checking conditions:
- T (8) immediate left of S (1): Correct.
- 2 people between T (8) and Q (7): Counter-clockwise between 8 and 7 via 1,2,3,4,5,6 is 6 people, but clockwise 8 to 7 is 0? Wait: 2 people between T and Q means 5 and 6, so Q is at seat 4? But V is at seat 4.
If Q is at seat 5, 2 people between T (8) and Q (5) are seats 6 and 7! Then U (seat 6) is adjacent to Q (5) and P (7)? Then P is seat 7, second to right of Q (5).
Let's re-verify:
Seat 1: S
Seat 2: W
Seat 3: R
Seat 4: V
Seat 5: Q
Seat 6: U
Seat 7: P
Seat 8: T
Check conditions:
- T (8) immediate left of S (1): Correct.
- Two people between T (8) and Q (5): Seats 6 and 7 (U and P). Correct!
- P (7) sits second to the right of Q (5): Facing center at seat 5, right is towards seat 6, 7. Second to right is seat 7 (P). Correct!
- U (6) sits adjacent to both P (7) and Q (5): Correct!
- V (4) sits opposite T (8): Correct!
- R (3) sits adjacent to V (4) but not Q (5): Correct!
- W (2) sits between R (3) and S (1): Correct!
Now let's trace anti-clockwise starting from P (Seat 7):
Anti-clockwise order goes: Seat 7 → Seat 8 → Seat 1 → Seat 2 → Seat 3 → Seat 4 → Seat 5 → Seat 6
Original occupants:
1. Seat 7: P
2. Seat 8: T
3. Seat 1: S
4. Seat 2: W
5. Seat 3: R
6. Seat 4: V
7. Seat 5: Q
8. Seat 6: U
New alphabetical arrangement starting from P anti-clockwise:
1. P
2. Q
3. R
4. S
5. T
6. U
7. V
8. W
Comparing position by position (excluding P):
- Position 2: T vs Q (Changed)
- Position 3: S vs R (Changed)
- Position 4: W vs S (Changed)
- Position 5: R vs T (Changed)
- Position 6: V vs U (Changed)
- Position 7: Q vs V (Changed)
- Position 8: U vs W (Changed)
None of the positions remain unchanged.
Therefore, the position of None of the colleagues will remain unchanged.
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