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In this type of questions, some clues regarding seating or placing sequence (linear or circular) of some persons or items is given. The candidate is required to form the proper sequence using these clues and answer the questions accordingly.

(i). Eleven students, A, B, C, D, E, F, G, H, I, J and K, are sitting in the first row of the class facing the teacher.
(ii). D who is to the immediate left of F is second to the right of C.
(iii). A is the second to the right of E, who is at one of the ends.
(iv). J is the immediate neighbour of A and B and third to the left of G.
(v). H is to the immediate left of D and third to the left of I.

If E and D, C and B, A and H and K and F interchange their positions, which of the following pairs of students is sitting at the ends ?

Option:
A. D and E
B. E and F
C. D and K
D. K and F
E. None of these
Answer: C . D and K

Justification:

D is to the left of F and second to the right of C i.e. C - D F.
A is second to the right of E i.e. E - A.
J is immediate neidhbour of A and B and third to the left of G i.e. A J B - G.
H is the left of D and third to the right of I i.e. I - H D.
The above four orders may be combined to obtain the correct order as under :
E, K, A, J, B, I, G, C, H, D, F

The new sequence formed on interchanging seats is :
D, F, H, J, C, I, G, B, A, E, K
D and K are sitting at the ends in the new arrangement.

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