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6 persons A, B, C, D, E and F are sitting in a row facing north (not necessarily in the same order). A is the immediate neighbour
of D and F. F is the immediate neighbour of E and A. B is in the second position from the right end. If D is not at any of the ends,
then how many persons are sitting towards the left of D?
2
1
5
3
- Six people are sitting in a row facing north: A, B, C, D, E, F.
- D is not at any end. This places D in positions 2 to 5.
- B is in the second position from the right end: [_, _, _, B, _, _].
- A is the immediate neighbor of D and F. Therefore, possible positions for A are determined.
- F, an immediate neighbor of E and A, further narrows the arrangement.
Building the sequence:
- If B is second from the right, then arrange D, A, F, E in remaining slots: [F, A, D, C, B, E].
- Count to the left of D gives us three positions.
? The correct answer is Option 4: 3.
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