Question
A, B, C, D, E, F and G live on seven different floors of the same building. The lowermost floor in the building is numbered 1, the floor above it is numbered 2 and so on till the topmost floor is numbered 7. Only two persons live above C. Only two persons live between C and E. B lives immediately above E. D lives immediately below F. A does not live on the lowermost floor. On which floor number does A live?
This question was previously asked in
RRB ALP 2025 CBT 2 Wiremen Question Paper (28-Jul-2026) (Shift 2)
The correct answer is
Floor number 4
Solving the Seven-Floor Building Logic Puzzle
This solution determines the floor number for person A by logically deducing the position of each resident based on the provided clues.
Key Constraint Deductions
- Two people above C: With 7 floors, this means C must be on floor 5 (Floors 6 and 7 are above).
- Two people between C and E: C is on floor 5. To have two people between them, E must be on floor 2 (Floors 3 and 4 are between C and E).
- B immediately above E: Since E is on floor 2, B must be on floor 3.
- D immediately below F: F and D are neighbours, with F above D. They form a block (F, D).
- A not on floor 1: A cannot occupy the lowest floor.
Step-by-Step Floor Assignment
- Current assignments: Floor 5: C, Floor 3: B, Floor 2: E.
- Consider the (F, D) block. They need two adjacent empty floors. The available pairs are (7, 6) and (4, 3 - blocked by B), (3, 2 - blocked by B & E), (2, 1 - blocked by E). The only valid adjacent empty slots are floors 7 and 6. Thus, F is on floor 7 and D is on floor 6.
- Remaining people: A and G. Remaining floors: 4 and 1.
- A does not live on floor 1. Therefore, A must live on floor 4.
- G lives on the remaining floor, floor 1.
Final Floor Layout
The deduced floor arrangement is:
| Floor 7 | F |
| Floor 6 | D |
| Floor 5 | C |
| Floor 4 | A |
| Floor 3 | B |
| Floor 2 | E |
| Floor 1 | G |
Based on this arrangement, A lives on floor number 4.
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Important Questions from Floor Puzzle
- If P is on the first step, on which step is S?
- If P is on the first step, which of the following is true?
- If T was on the third step, which of the following pairs is incorrect?
If T joined P, Q, R and S, and T was on the third step, and Q was on a higher step than T, which step must be vacant?
If there are two steps in between the steps on which A and D are standing and C is standing on Step 6, A must be standing on which of the following steps?
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