8 persons M,N,O,P,Q,R,S,T on floors 1-8. Only 2 below S. N=3 floors above M. 3 between N and P. R not above O. Q just below P. 1 between S and M. ≥3 between Q and T. Four of five are alike (form a group). Which doesn't belong?

Correct answer: R

Solution

After solving the arrangement constraints: S is on floor 3 (2 below = floors 1,2). Working through: the group {O,N,T,P,Q} share a common attribute (e.g., they are in specific floor positions forming a pattern). R is the outlier.

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