A, B, C, D, E, F and G are sitting around a circular table, facing the centre. A is an immediate neighbour of both E and B. B sits third to the left of F. D sits to the immediate left of F. G is not an immediate neighbour of B. How many people sit between C and G, when counted from the right of G?
3
They face the centre, so moving to a person's left means moving clockwise around the table. Fix B, and place F three positions to B's left (clockwise).
D sits to the immediate left of F, so D is one position clockwise from F. A is an immediate neighbour of both E and B, so A sits between E and B, giving the sequence E, A, B in order.
Filling the seven seats clockwise with these links gives the order A, B, C, D, F, G, E around the table, which leaves G not adjacent to B as required.
Starting from G and moving towards its right (anticlockwise), we pass F and D before reaching C, so two people sit between C and G when counted from the right of G.
Hence, the number of people sitting between C and G, counted from the right of G, is 2.
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