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We have, F sits second to the left of G. Only two persons are sitting between G and C. From the above condition, there are two possibilities. Again we have, Only one person sits between C and B. B does not sit adjacent to G. The number of persons sits between G and B is the same as the number of persons sit between G and E.
Again we have, The number of persons sits between F and C is one less than the number of persons sits between E and B, when counted to the right of both F and B respectively. B sits exactly in the middle of A and C. D sits second to the right of A. From the above condition, case1 gets eliminated. Case 2 shows the final arrangement.
1290, 1225, 1175, ?, 1112, 1095, 1085
65, 90, 140, ?, 315, 440
7 4 5 9 20 ? 160.5
22, 38, 74, 138, ?, 382
143 119 107 101 98 ?
10, 15, 25, 35, ?, 65
72, 79, 100, 135, 184, ?
362 452 550 656 770 892 ?
...98, 122, 182, 278, 410, ?