Four in a row — Seating & Puzzles Aptitude Question
Four in a row: Four people sit in a row. B is at the left end, D is immediately to the right of B, A is not at… Answer and worked solution on CodeKairo.
- Topic: Seating & Puzzles
- Section: Logical Reasoning
- Difficulty: Medium
- Time target: 90 seconds
Question
Four people sit in a row. B is at the left end, D is immediately to the right of B, A is not at either end, and C is immediately to the right of A. Who sits at the right end?
Options
- A
- B
- C
- D
Show the answer and the worked solution
Correct answer: C. C
Worked solution
- B = seat 1 and D = seat 2.
- Seats 3 and 4 remain for A and C, and A is not at an end, so A = seat 3.
- C is immediately to the right of A, so C = seat 4.
- The row is B, D, A, C and the right end is C.
Answer: C.
The idea
Place the clues that fix a seat outright, then let the remaining constraint settle the rest. Check the finished row against every clue.
Shortcut. Once B and D take seats 1 and 2, only seats 3 and 4 are free, and 'C immediately right of A' fills them as A, C — C ends up at the right without the 'not at an end' clue.
Common trap. "D" — reading 'D is immediately to the right of B' as 'D is at the right end'; D sits right next to B, in seat 2.