How many persons sit between D and C?

We have, F sits fifth to the right of B. Only two persons sit between F and E. From the above conditions, there are three possibilities Again we have, The number of persons sitting to the right of E is one less than the number of persons sitting to the left of C. Only one person sits between C and H. D sits third to the left of H. Here, Case-3 gets eliminated Again we have, Only three persons sit between A and G, who doesn’e sit at the end of the row. So Case-2 gets eliminated. Hence Case-1 shows the final arrangement