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Five students P, Q, R, S and T are standing in a row. R is third to the left of T. P is second to the right of R. Q is not at either end. Who is standing at the extreme right end?
S
T
P
Q
T
Fix the reference point (R) first based on the most restrictive condition (R is 3rd to left of T), then place remaining members relative to that frame.
Fix the reference point (R) first based on the most restrictive condition (R is 3rd to left of T), then place remaining members relative to that frame.
Establish the anchor positions
Let the five positions be 1, 2, 3, 4, 5 from left to right. Since R is third to the left of T, if T is at 4, R is at 1 (1, 2, 3, 4). If T is at 5, R is at 2 (2, 3, 4, 5).
Apply P's position
P is second to the right of R. If R is at 1, P is at 3. If R is at 2, P is at 4. We know T is at 5 if R is at 2.
Final placement
If R is at 2, P is at 4, T is at 5. Remaining are Q and S. Since Q is not at either end, Q must be at 3. Thus, S must be at 1. The arrangement is S, R, Q, P, T. Checking all constraints: R is 3rd left of T (Yes), P is 2nd right of R (Yes), Q is not at ends (Yes). Extreme right is T.
A: S is at the extreme left, not the extreme right. C: P is in the 4th position, not the extreme right. D: Q is in the 3rd position, which is the middle of the row.
B is correct because the seating arrangement S, R, Q, P, T satisfies all constraints, placing T at the extreme right position.
In row seating puzzles, always look for the person mentioned as a reference for others and place them first to create a solid framework.