Eight persons sit in a linear row and face north. All of them work in a company on different designations viz. CMD, CEO, COO, CFO, Manager, AM, HR and Intern. S sits third to the right of P who is CMD, and either of them sit on the extreme end of the row. Two persons sit between S and the one who is Intern. T is an immediate neighbor of S and sits third to the left of V. Four persons sit between V and U who is COO. The number of persons sit left of R is same as the number of persons sit right of W. R is not intern. The one who is AM sits second left of Q who is CFO. The one who is CEO sits left of the one who is Manager but sits right of the one who is HR.

Four of the following five are alike in a certain way so form a group, which of the following does not belong to that group?

Correct Answer: S-R

Step-by-Step Explanation:

Step 1: Determine the positions of the 8 persons (from left to right, numbered 1 to 8, all facing North)

1. "S sits third to the right of P who is CMD, and either of them sit on the extreme end of the row."
If S were on an extreme end, since S is to the right of P, S would be at position 8, which makes P at position 5. But then neither P nor S would be at an extreme end unless P is at position 1. If P is at position 1 (extreme left end), then S sits third to the right of P, placing S at position 4.
Let's verify: Position 1 = P (CMD). Position 4 = S.
This satisfies "P is on the extreme end" (position 1).

2. "Two persons sit between S and the one who is Intern."
Since S is at position 4, the Intern can be at position 1 or position 7. But position 1 is P (CMD), so the Intern must be at position 7.

3. "T is an immediate neighbor of S and sits third to the left of V."
S is at position 4, so T can be at position 3 or position 5.
- If T is at position 5: T sits 3rd to the left of V, which puts V at position 8.
- If T is at position 3: T sits 3rd to the left of V, which puts V at position 6.

4. "Four persons sit between V and U who is COO."
- Case A: If V is at position 8, then 4 persons between V and U means U is at position 3 (8 - 4 - 1 = 3). Here T was at position 5, so U at position 3 is valid.
- Case B: If V is at position 6, U would need to be at position 1 (6 - 4 - 1 = 1), but position 1 is already P (CMD), not U (COO). Thus, Case B is invalid.

Therefore, we have:
- Position 1: P (CMD)
- Position 3: U (COO)
- Position 4: S
- Position 5: T
- Position 7: (Intern)
- Position 8: V

5. "The number of persons sit left of R is same as the number of persons sit right of W. R is not intern."
The available positions for remaining persons (R, W, Q) are 2, 6, 7.
Since R is not at position 7 (Intern), R must be at position 2 or position 6.
- If R is at position 2 (1 person to the left of R), then W must be at position 7 (1 person to the right of W).
- If R is at position 6 (5 persons to the left of R), then W must be at position 3, but position 3 is occupied by U.
Thus, R is at position 2, W is at position 7 (Intern), and the remaining person Q is at position 6.

Seating Order Summary (Positions 1 to 8):
1: P (CMD)
2: R
3: U (COO)
4: S
5: T
6: Q (CFO)
7: W (Intern)
8: V

Step 2: Determine the Designations

1. "The one who is AM sits second left of Q who is CFO."
Q is at position 6, so the one at position 4 (S) is AM.

2. "The one who is CEO sits left of the one who is Manager but sits right of the one who is HR."
The remaining unassigned positions are 2 (R), 5 (T), 8 (V), and the remaining designations are HR, CEO, Manager.
Since HR < CEO < Manager from left to right:
- Position 2 (R) = HR
- Position 5 (T) = CEO
- Position 8 (V) = Manager

Final Seating Arrangement:
1: P - CMD
2: R - HR
3: U - COO
4: S - AM
5: T - CEO
6: Q - CFO
7: W - Intern
8: V - Manager

Step 3: Analyze the Options

Let's check the number of persons sitting between each pair in the given options:
- P-U: P is at 1, U is at 3 ⇒ Exactly 1 person (R) sits between them.
- T-W: T is at 5, W is at 7 ⇒ Exactly 1 person (Q) sits between them.
- Q-V: Q is at 6, V is at 8 ⇒ Exactly 1 person (W) sits between them.
- S-R: S is at 4, R is at 2 ⇒ Exactly 1 person (U) sits between them.

Wait, let's look at the directional relationship:
- P to U: U sits second to the right of P.
- T to W: W sits second to the right of T.
- Q to V: V sits second to the right of Q.
- S to R: R sits second to the left of S.

In all pairs except S-R, the second person sits to the right of the first person. Therefore, S-R does not belong to the group.