Six persons — A, B, C, D, E and F — are sitting in a circle, facing the…

Concept: In a circular seating puzzle where everyone faces the centre, walking clockwise (as seen from above) from any person takes you to the seat on their left, and walking anticlockwise takes you to the seat on their right — the opposite of how left/right feels when facing outward. Two people 'face' each other only when they sit diametrically opposite, i.e. exactly three seats apart in a six-member circle. Once the seating order is fixed, an exchange of seats swaps only the two named occupants; it never changes which physical seats are adjacent or opposite.

1. From "C is to the left of D", C is immediately clockwise after D: chain D, C.

2. From "B is to the left of C", B is immediately clockwise after C: chain D, C, B.

3. From "B is to the right of E", B is immediately anticlockwise of E (i.e., E follows B clockwise): chain D, C, B, E.

4. From "F is to the right of A", F is immediately anticlockwise of A (i.e., A follows F clockwise): pair F, A.

5. Only F and A remain to complete the six-seat circle; attaching this pair after E and before D closes the circle as: D, C, B, E, F, A.

6. Facing check: in this order, A and B are exactly three seats apart — the diametrically-opposite spacing in a six-seat circle — confirming "A is facing B", so the arrangement is consistent.

7. Apply the exchanges: D swaps seats with F, giving F, C, B, E, D, A; then E swaps seats with B, giving the final clockwise order F, C, E, B, D, A.

8. Reading this final order, the seat immediately clockwise after D holds A — and since walking clockwise leads to each person's left (per the concept above), A is sitting to D's left.

Cross-check: reversing both exchanges on the final order F, C, E, B, D, A (swap B back with E, then F back with D) regenerates the original D, C, B, E, F, A sequence, confirming no step was miscounted.

Therefore, A is sitting to the left of D after the swaps.