Seven persons - A, B, C, D, E, F and G sit in a linear row from west to east and face in the north direction.
Either one or two persons sit to the left of A.
Either three or four persons sit between A and F, who does not sit second from any end of the row.
C sits third to the left of D. C and D do not sit at any extreme end.
B sits second to the right of G. Thus, case 1 is invalid.
Therefore, the final arrangement is:
E sits second to the left of A and D sits second to the right of A.
C sits second to the left of G and B sits second to the right of G.
Similarly,
A sits second to the left of D and F sits second to the right of D.
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