Eight boxes, namely M, N, O, P, Q, R, S and T, are placed one above the other but not necessarily in the same order. Three boxes are placed between M and T. M is placed either at the topmost or bottommost position. Box O is placed just above box N. Box S is placed just below box T. There are two boxes placed between R and S. Not more than two boxes are placed between M and R. More than three boxes are placed between O and P. Four of the following five are alike in a certain way and hence form a group. Which one of the following does not belong to that group?

M and Q
P and T
R and S
Q and O

Correct answer: Q and O

Solution

The clues force a unique vertical arrangement of the eight boxes. In the final order, three of the pairs follow the same relation pattern, while Q and O do not match that pattern. Hence, Q and O is the odd pair out.

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