Three letter groups with constant jump three – UGC NET Question

In each group, the letters are spaced three positions apart within the alphabet. ADG uses positions 1, 4 and 7; BEH uses 2, 5 and 8; CFI uses 3, 6 and 9; and DGJ uses 4, 7 and 10. The starting letter increases by one each time, so the next group must start at E and use letters at positions 5, 8 and 11, which are E, H and K. Thus EHK is the correct continuation.

Option A:
Option A is correct because it preserves both the constant gap of three between letters and the progression of the starting letters. E, H and K lie in exactly the same positional relationship as the letters in all previous groups. This consistent structure shows that EHK naturally follows DGJ in the series.

Option B:
Option B, EHL, uses the right first two letters but ends with L, which is position 12 rather than 11. That makes the last gap four instead of three. Since the groups are defined by a fixed difference of three between successive letters, EHL does not respect the pattern.

Option C:
Option C, EGI, has unequal gaps between its letters and does not align with the arithmetic spacing seen earlier. The distances between E, G and I differ from those in ADG, BEH, CFI and DGJ. Consequently, EGI cannot be regarded as a valid continuation.

Option D:
Option D, FHK, starts at F instead of E and therefore does not extend the simple sequence of starting letters from A to D. It also fails to keep the precise spacing structure, so FHK is inconsistent with the series rule.