Study the following information carefully and answer the question given below:…
2022
Study the following information carefully and answer the question given below:
Nine persons attend an event one after another. At most two persons attend the event before G. Three persons attend the event between C and G. Two persons attend the event between C and B. One person attends the event between B and K, and K attends after B. F attends the event just before L. There are as many persons who attend before L as there are who attend after H. E attends the event exactly between B and K. D attends the event before E.
How many persons attend the event between D and the one who attends just before K?
Answer: E. None of these — ConceptLinear-arrangement puzzles are solved by anchoring the most constrained clue first, then layering the remaining clues onto fixed reference points. Each…
- A.
Three
- B.
Four
- C.
Five
- D.
One
- E.
None of these
Attempted by 4 students.
Show answer & explanation
Correct answer: E
Concept
Linear-arrangement puzzles are solved by anchoring the most constrained clue first, then layering the remaining clues onto fixed reference points. Each clue gives either a fixed gap ("X persons between") or a fixed direction ("after / just before"). "N persons between two people" means their positions differ by N+1; "just before" means an adjacent pair with no gap; and a "between" clue can be read in either direction unless an order is also stated.
Application
Number the nine slots 1 (first to attend) to 9 (last). Apply the clues in order of how much they pin down:
At most two persons attend before G, so G occupies slot 1, 2 or 3 — no later than the 3rd slot.
Three persons sit between C and G, so the C–G gap spans 4 slots. If G were at slot 1 or 2, C would land at slot 5 or 6, but then no later clue can be satisfied consistently; only G at slot 3 with C at slot 7 fits every remaining clue.
Two persons sit between C and B, so the C–B gap is 3. With C at slot 7, B must be at slot 4 (slot 10 does not exist).
One person sits between B and K with K after B, so K is two slots after B: K at slot 6.
E sits exactly between B (4) and K (6), so E is at slot 5; D attends before E, and the remaining early slot places D at slot 2.
F is just before L (adjacent), and “as many before L as after H” fixes the ends: H at slot 1, F at slot 8, L at slot 9.
This gives the unique seating:
Slot | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|---|
Person | H | D | G | B | E | K | C | F | L |
Answer
The person just before K (slot 6) is the one at slot 5, namely E. D is at slot 2. The persons sitting strictly between slot 2 and slot 5 are at slots 3 and 4 — that is G and B, a count of two.
Cross-check
Re-verify the two boundary clues against the final order: persons before L = 8 and persons after H = 8 (equal, as required), and E (slot 5) is the exact midpoint of B (slot 4) and K (slot 6). The required count is two persons. Since two is not listed among Three, Four, Five or One, the correct choice is “None of these.”