What should come in place of the question mark (?) in the given series based on the English alphabetical order? DGY HKC LOG PSK ?
TWO
Use alphabet positions (A = 1, …, Z = 26, counting cyclically after Z) and follow each letter place of the clusters separately.
First letters: D (4), H (8), L (12), P (16) – each +4, so the next is T (20). Second letters: G (7), K (11), O (15), S (19) – each +4, so the next is W (23).
Third letters: Y (25), C (3), G (7), K (11) – each +4 (Y + 4 = 29 → 3 after Z), so the next is O (15). Therefore the missing cluster is T W O.
| Cluster | DGY | HKC | LOG | PSK | ? |
| 1st letter | D | H | L | P | T |
| 2nd letter | G | K | O | S | W |
| 3rd letter | Y | C | G | K | O |
Check: every letter of each cluster is 4 places ahead of the letter in the same place of the previous cluster (PSK → TWO: P + 4 = T, S + 4 = W, K + 4 = O), so the series continues correctly.
Hence, TWO.
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