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Seven people, A, B, C, D, E, F and G are sitting in a row, facing north. E sits third from the left end. Only three people sit between G and E. B is the immediate neighbour of C and F. D sits second to the left of C. How many people sit between A and F?
One
Four
Three
Two
Four
Determining Persons Between A and F in Linear Row Facing North
Fix Positions of E and G
E is at position 3 (from left: 1, 2, 3, 4, 5, 6, 7). With 3 people between G and E, G must be at position 7 (3+3+1=7).
Positions so far: _ _ E _ _ _ G
E=Position3,G=Position7
Place C, B, and F
B is an immediate neighbour of both C and F, requiring triplet C-B-F or F-B-C. Also, D sits second to the left of C. Placing C at pos 4 gives D at pos 2. Then B is at pos 5 and F is at pos 6.
Position 1 is occupied by the remaining person, A.
Full┬аsequence:1:A,2:D,3:E,4:C,5:B,6:F,7:G
Count Persons Between A and F
A is at position 1 and F is at position 6. The people sitting between them are D, E, C, and B (4 people).
4 people sit between A and F
Option B is correct тАФ four
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