Eight persons sit in a row. Four persons face north and the remaining four face south. Three persons sit between A and B, and one of them is seated at an end of the row. C sits second to the right of B, who faces north. D and B face the same direction but are not seated next to each other. E sits third to the left of D and faces the opposite direction to D. G sits third to the right of C. Both immediate neighbors of G face the same direction. H sits to the right of F. Which of the following pairs is different from the other four pairs?

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**Solution:**

1. From the given conditions, the seating order from left to right is:
   $$B, H, C, E, A, G, D, F$$

2. Directions faced by each person:
   - B faces north (given).
   - D faces the same direction as B, so D faces north.
   - E faces opposite to D, so E faces south.
   - C is second to the right of B, so C faces north (since neighbors of G face same direction and G is third to right of C).
   - G sits third to the right of C.
   - Both neighbors of G face the same direction.
   - H sits to the right of F.

3. Analyzing p![image.png](https://res.cloudinary.com/aptidude/image/upload/v1756912931/aptidude_questions/nkidaenxchrhn9u8kqdh.png)airs:
   - C-E: C faces north, E faces south (opposite directions).
   - A-G: Both face south.
   - D-F: D faces north, F faces south.
   - B-H: B faces north, H faces south.
   - G-C: This is the reverse of C-G, but since pairs are unordered, this is the same as C-G.

4. The question asks which pair is dissimilar to the other four. Among the pairs, "G-C" is the same as "C-G" but listed differently, making it the odd one out.

**Answer:** G-C

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