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Six students P, Q, R, S, T and U are sitting in a row facing north. P sits third to the right of U. S is not sitting at either end. Q sits to the immediate left of R. If T is at the extreme right end, who sits at the extreme left end?
U
P
S
R
U
Place the fixed anchor (T at extreme right) first, then position the P-U block (P is 3rd to the right of U) to determine the remaining gaps.
Place the fixed anchor (T at extreme right) first, then position the P-U block (P is 3rd to the right of U) to determine the remaining gaps.
Establish the anchor and P-U relation
There are 6 positions: 1 2 3 4 5 6. T is at 6. P is 3rd to the right of U (U _ _ P). If U is at 1, P is at 4. If U is at 2, P is at 5 (but P cannot be at 5 because 6 is T and 5 would be right next to it, and this must fit with other constraints).
Fill the remaining positions
With T at 6, and the constraint that Q is immediate left of R (QR pair), we have empty spots. Placing U at 1 and P at 4 leaves 2, 3, and 5. Since S is not at the ends, S must be at 2, 3, or 5. Since Q is immediate left of R, they must occupy 2 and 3. This leaves 5 for S.
Final verification
Arrangement: U (1), Q (2), R (3), P (4), S (5), T (6). Check: P is 3rd to right of U (1+3=4, Correct). S is not at ends (S is at 5, Correct). Q is immediate left of R (2, 3, Correct). T is at extreme right (6, Correct). Leftmost is U.
B: P is at position 4, not the extreme left. C: S is at position 5, which is not the extreme left. D: R is at position 3, not the extreme left.
A is correct because placing U at the extreme left (1st position) satisfies all given conditions including P being 3rd to the right (4th position) and T being at the extreme right (6th position).
In row-based puzzles, always fill the most restricted entity first (like T at the end) and use the block method (e.g., Q-R) to visualize slots quickly.
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