RAS question
Six persons A, B, C, D, E, F sit in a row facing north. C sits third to the left of F. B sits at the right end. A is an immediate neighbour of both C and D. E does not sit at any end. Who sits at the left end?
Correct answer: (B) C.
In the row arrangement C sits at the left end.
Explanation
Number the six seats from left to right as positions 1 to 6, because all six persons face north and the question is a linear seating-arrangement puzzle. The cited guide identifies seating arrangements as puzzles that use linear arrangements and direction rules, so the key is to translate each clue into a fixed position. B is at the right end, so B is in position 6. Since C is third to the left of F, the workable placement is C in position 1 and F in position 4. A must be an immediate neighbour of both C and D, so A sits between them: C in position 1, A in position 2, and D in position 3. E cannot be at an end and takes position 5. The final order is C, A, D, F, E, B.
Why the other options are wrong
- (A) D sits in position 3 because A has to be an immediate neighbour of both C and D, so D cannot occupy the left end.
- (C) E is explicitly not allowed to sit at any end, and after the fixed placements it fits only in position 5.
- (D) A sits in position 2 as the common immediate neighbour of C and D, so A is adjacent to the left end but not on it.
Concept
This tests linear seating arrangement with direction and neighbour constraints. RAS uses such questions because they check whether candidates can convert verbal clues into a fixed ordered layout without adding assumptions.