Discussion
Four of the following five are alike in a certain way, and so form a group. Which of the following does not belong to the group?
Answer: D
Correct answer: T, Y
S faces north with only two people to his right, so S sits sixth. T is third to S’s left, in seat 3. One person sits between T and X, X is immediately right of W, one person sits between W and Z, and U is third to X’s left; together these fix the row. The facing rules then follow - T is opposite S, T’s two neighbours match each other, V matches W, and Y and U are both opposite Z:
1 V (N) · 2 Z (N) · 3 T (S) · 4 W (N) · 5 X (S) · 6 S (N) · 7 Y (S) · 8 U (S)
So V, Z, W and S face north while T, X, Y and U face south. Each of the other four pairs puts one person from each group together - W and X, Z and Y, T and S, V and U all face opposite ways. T and Y are the exception: both face south, so that pair does not belong.
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