Seven people, A, B, C, D, E, F and G, are sitting in a row, facing north. Only three people sit between D and E. B sits to the immediate left of E. No one sits to the right of G. Only two people sit between G and B. A sits to the immediate right of F. How many people sit to the right of C?
1
They face north, so each person's left is our left and their right is our right; number the seats 1 to 7 from left to right.
No one sits to the right of G, so G is at the extreme right, seat 7. Only two people sit between G and B, so B is at seat 4.
B sits to the immediate left of E, so E is at seat 5. Only three people sit between D and E; with E at seat 5, D must be at seat 1 (seats 2, 3, 4 lie between them).
The empty seats now are 2, 3 and 6 for A, C and F. A sits to the immediate right of F, so F and A occupy seats 2 and 3, leaving seat 6 for C.
The final row is D, F, A, B, E, C, G; with C at seat 6, only G (seat 7) sits to its right.
Hence, the number of people sitting to the right of C is 1.
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