Direction : Read the given information carefully and answer the questions…

Concept: In a floor-and-flat 'couples' puzzle, every floor-flat cell houses exactly one married couple. So two names 'go together' precisely when the clue chain forces them into the same cell. A 'four alike, one different' question over listed name-pairs is really asking: which listed pair is the one that the clues never place in a shared cell, while the other four are genuine married couples.

Working through the placement, step by step (a single-direction clue such as 'north of' or 'east of' pins BOTH people to the same value on the other axis — same flat for a pure floor-direction, same floor for a pure flat-direction — while a diagonal clue such as 'north-east' or 'south-west' lets both axes differ):

1. Names starting with a vowel (A, E, O, U) are female and must live on an even floor (2 or 4).

2. B lives on an even floor and two floors above N; the only floor pair that matches 1–4 is N = 2, B = 4.

3. U is a vowel name (female, even floor). 'T lives north-east of U' (diagonal) puts U in the west flat and T in the east flat, T above U. Since U must be even and T strictly above U within floors 1–4, U = floor 2, west flat. 'T lives below E' then forces T = floor 3, E = floor 4 (the only even floor above 3).

4. Flat 1 is fixed as west and Flat 2 as east on every floor. 'S lives south-west of B' (diagonal) forces B into the east flat and S into the west flat, with S below floor 4. Floor 2 west is already U's cell, and S is explicitly female, while U is also forced female by the vowel rule — two females cannot be married to each other — so S cannot be on floor 2. Combined with 'S doesn't live below N' (floor 2), S must be on floor 3, west flat.

5. A lives with her own spouse in the west flat (her spouse is in the 'odd-numbered' flat, i.e. Flat 1). 'A lives just above P's spouse's flat' puts A on an even floor, west flat. Floor 2 west is U's cell, and two vowel-forced females (A and U) cannot marry each other, so A must be floor 4, west flat. P's spouse (and so P himself) is then exactly one floor below — floor 3, west flat — which is S's cell, making P and S a married pair.

6. Floor 4 is now full: A + spouse (west), B + spouse (east). E must also be on floor 4, and E cannot be A's spouse (again, two vowel-forced females cannot marry each other) — so E shares B's east cell, making B and E a married pair.

7. O is also vowel-forced (female, even floor: 2 or 4). O cannot be on floor 4: the west cell there would make her A's spouse (two vowel-forced females can't marry), and the east cell (B-E) is already full. So O must be on floor 2, and since 'O and Q live on the same floor', Q is on floor 2 too. O cannot share U's floor-2 west cell for the same vowel-female reason, so O takes the floor-2 east cell. Since 'Q doesn't live in the same flat as E' and E is in the east flat, Q must be in the west flat — so Q fills U's cell as her spouse. N, who must be on floor 2, is the only name left for O's cell, making O and N a married pair.

8. For the remaining names (C, R, V, W, X, Y): X's own flat is fixed as east (his spouse lives east of Y). If X's cell were floor 3 (sharing T's), then 'R lives to the north of X' (a pure floor-direction, so R shares X's flat too) would need R in the east flat on a higher floor — the only such open slot is floor 4 east, but that's already B-E's full cell, leaving no room; so X cannot be on floor 3. X must be on floor 1, east flat, and R — sharing X's east flat, on a higher floor — takes floor 3 east alongside T, making R and T a married pair.

9. 'Spouse of X lives to the east of Y' is a pure flat-direction, so it also pins Y to the SAME FLOOR as X's spouse — floor 1. So Y is on floor 1, west flat: exactly V's flat (V shares U's flat and gender, and floor 2 is unavailable to her, so V is also floor 1 west). Floor 1 west holds only 2 people, so V and Y share that cell and are married. 'C is spouse of neither Y nor X' then leaves W as the only name for X's floor-1 east cell: W and X are married. The one remaining name, C, takes the floor-4 west slot alongside A, making A and C a married pair — and confirming B, already married to E, is never A's partner.

Checking the five listed pairs against this placement:

V-Y, W-X, B-E and P-S are all genuine married couples in the placement forced by the clues, while A and B are never in the same cell. So A-B is the pair that does not belong to the group.