Four of the following five are alike in a certain way based on the given arrangement and so form a group. Which is the one that does not belong to that group?

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Accepted Answer

Step-by-step reasoning:

1. From “Only two persons have less experience than K” we get K at position $3$ (Departments in increasing experience: 1 Admin, 2 Production, 3 Marketing, 4 HR, 5 Finance, 6 R&D, 7 CR). So K = pos$3$. 
2. P works in R&D, so P = pos$6$. 
3. HR (pos$4$) is more experienced than both L and N, and only two people are less experienced than K (pos$3$), so L and N must occupy pos$1$ and pos$2$. Given N is not the least, N = pos$2$, L = pos$1$. 
4. The Wanted-fan is more experienced than K and less than the Jumanji-fan; Wanted cannot be Finance (pos$5$) and P is not Wanted or Jumanji. The only fit is Wanted at pos$4$ and Jumanji at pos$7$. Thus pos$4$ = Wanted, pos$7$ = Jumanji. 
5. J is more experienced than K and likes Twilight, so J = pos$5$ (Twilight). Then M must be more experienced than J, so M = pos$7$ (Jumanji). P at pos$6$ must be the Hero-fan (pos$6$), leaving Signs at pos$3$ (K), and Gladiator/Dread at pos$1$/pos$2$ with L = pos$1$ (Gladiator) and N = pos$2$ (Dread).

Final arrangement (pos = experience rank):
- pos$1$: L (Admin) — Gladiator
- pos$2$: N (Production) — Dread
- pos$3$: K (Marketing) — Signs
- pos$4$: O (HR) — Wanted
- pos$5$: J (Finance) — Twilight
- pos$6$: P (R&D) — Hero
- pos$7$: M (CR) — Jumanji

Now evaluate the given pairs by the absolute difference in experience positions $|pos(first)-pos(second)|$:
- MO: $|7-4|=3$
- NK: $|2-3|=1$
- PK: $|6-3|=3$
- NJ: $|2-5|=3$
- LO: $|1-4|=3$

Four pairs (MO, PK, NJ, LO) have an experience-position difference of $3$; NK has difference $1$, so NK does not belong to that group.

FINAL_ANSWER: b

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