A certain number of persons sit in a linear row, all facing north. The following conditions are given:
- P sits third to the right of S. - Exactly three persons sit between P and Q. - U sits third to the left of Q. - U is fifth from the left end of the row. - R sits third to the left of U. - Exactly three persons sit between W and T, and T is an immediate neighbor of R. - Exactly six persons sit to the right of W. - M sits immediately to the left of O. - Exactly three persons sit between M and H. - O does not sit to the left of P. - H does not sit at the extreme end of the row.
Four of the following five are similar in a certain way and form a group. Which one does not belong to the group?

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**Solution:**

1. Since U sits fifth from the left end, we place U at position 5.

2. R sits third to the left of U, so R is at position 2.

3. T is an immediate neighbor of R, so T can be at position 1 or 3.

4. Exactly three persons sit between W and T, and six persons sit to the right of W.

- If T is at position 1, W would be at position 5 (1 + 4), but position 5 is occupied by U.
   - So, T is at position 3, and W is at position 7 (3 + 4).

5. Since six persons sit to the right of W, total number of persons = 7 + 6 = 13.

6. P sits third to the right of S, and O does not sit to the left of P.

7. M sits immediately to the left of O, and exactly three persons sit between M and H.

8. H does not sit at an extreme end.

9. By placing all persons according to the above conditions, it is found that all except M belong to a particular group based on their seating positions or relations.

**Answer:** (c) M

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