Seven persons — A, B, C, D, E, F and G — are attending an event one after another, but not necessarily in the same order. G attends the event three persons after C. B attends the event immediately before C. Only one person attends the event between B and E. D attends the event four persons after E but before A. Three persons attend event between A and F.

Who attends the event in the last position?

The correct option is G.

Step-by-Step Explanation:

Let us arrange the 7 persons in order from position 1 (first) to position 7 (last).

1. "G attends the event three persons after C"
This means there are 2 persons between C and G, so G is at position (C's position + 3).
Structure: C, _, _, G

2. "B attends the event immediately before C"
So B is right before C.
Structure: B, C, _, _, G

3. "Only one person attends the event between B and E"
Since C is immediately after B, E cannot be after B. Therefore, E must be two positions before B.
Structure: E, _, B, C, _, _, G

4. Count the number of persons in this block:
E (1st in block), _ (2nd), B (3rd), C (4th), _ (5th), _ (6th), G (7th).
This forms a complete block of 7 persons! Thus, the exact order of positions 1 to 7 is fixed:

Position 1: E
Position 2: _
Position 3: B
Position 4: C
Position 5: _
Position 6: _
Position 7: G

5. "D attends the event four persons after E but before A"
Since E is at position 1, 4 persons after E means position 1 + 4 = 5.
So, D is at Position 5.

6. "but before A"
The remaining empty positions are 2 and 6. Since D (position 5) is before A, A must be at Position 6.
This leaves Position 2 for F.

7. Verification of remaining clue: "Three persons attend event between A and F"
F is at position 2 and A is at position 6. The persons between them are at positions 3, 4, and 5 (3 persons), which matches perfectly.

Final Order:
1. E
2. F
3. B
4. C
5. D
6. A
7. G

Therefore, G attends the event in the last position.