Question
Four of the following five are alike in a certain way
and hence form a group. Who among the following one does not belong to the group? Study the following information carefully and answer the below questions Six persons P, Q, R, S, T, and U are sitting around the rectangular table such that two persons were seated at each long side, and one person was seated at each shorter side of the table and they are all facing inside. They like different ice cream flavours Chocolate, Vanilla, Black walnut, Strawberry, Blueberry, and Blue mint. All the information is not necessarily in the same order. Q and R are not immediate neighbours. The one who likes Black walnut sits second to the left of the one who likes Blueberry who sits at the bottom side of the rectangular table. T and U are sitting diagonally opposite to each other. Q and the one who like Vanilla are immediate neighbours. U likes Chocolate who sits third to the left of the one who likes Black walnut and U is an immediate neighbour of the one who likes Blue mint. Only one person sits between P and the one who likes blueberry.Solution
The one who likes Black walnut sits second to the left of one who likes Blueberry who sits at the bottom side of the rectangular table. From the above conditions, there are two possibilities .
U likes Chocolate who sits third to the left of the one who likes Black walnut and U is an immediate neighbor of the one who likes Blue mint. T and U are sitting diagonally opposite to each other.
Q and the one who like Vanilla are immediate neighbors. Q and R are not immediate neighbours. Only one person sits between P and the one who likes blueberry. From the above condition, Case2 shows the final arrangement. 
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