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AC is only such pair which has as many letters between them in the given word “RESEARCH” as in the alphabetical series.
7, 22, 68, 207, 620, 1880
164, 20, 216, -40, 284, -112
8 5 6.5 11.75 26 65
...80, 88, 101, 122, 150, 185
8137, 5405, 3669, 2701, 2201, 1997
0.15, 3.15, 12.30 , 45.90, 195.60, 998
120, 139, 196, 291, 420, 595
13 74 355 1416 4245