6 persons are sitting in two rows, numbered 3–3. E does not sit at any of the…

Concept: In a two-row-of-three seating puzzle, seats in the two facing rows line up seat-for-seat — each seat has exactly one seat directly opposite it in the other row (same column), while a person's same-row companions on either side are their neighbours. A clue such as ‘X is second to the left of Y’ places X and Y in the same row at its two end seats, since the middle seat is only one step from either end.

Working it out:

1. “D is second to the left of F” places D and F at the two end seats of one row — D on the left end, F on the right end.

2. “B is neighbour of F”: since F sits at an end, F’s only same-row neighbour is the middle seat of its own row — so B fills that middle seat, giving the row order D – B – F.

3. “E does not sit at any end of any row”: with the D–B–F row now fully occupied, E cannot be in that row at all, so E must take the middle seat of the other row — its only non-end seat.

4. “C is neighbour of E” places C at one of the two end seats of E’s row (both are next to E’s middle seat); “C sits diagonally opposite to D” (D being at the left end of the D–B–F row) rules out the end seat that would face D directly, so C takes the far end, leaving the last seat for A. That row reads A – E – C.

5. With D – B – F facing A – E – C seat-for-seat, the seat directly in front of B (the row’s middle seat) is E’s seat.

Final layout:

Cross-check: D and F are the two ends of one row, two seats apart; E sits in a middle seat, not an end; C is adjacent to E and does not directly face D; B is adjacent to F. Every condition holds, confirming E is in front of B.