Question

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series: DA FH, D D KO, D G P V, D JU C, ?

• A. DMKA
• B. DJSH
• C. DMNS
• D. DMZJ

Answer 1

Answer:

D. DMZJ

Treat the terms as four-letter clusters:

• DAFH

• DDKO

• DGPV

• DJUC

• ?

Now observe each position separately:

Position	1	2	3	4	Next
1st	D	D	D	D	D
2nd	A	D	G	J	M
3rd	F	K	P	U	Z
4th	H	O	V	C	J

Patterns:

• 2nd letters: A → D → G → J → M (+3 each time)

• 3rd letters: F → K → P → U → Z (+5 each time)

• 4th letters: H → O → V → C → J (+7 each time, wrapping after Z)

Therefore, the next letter-cluster is:

$\boxed{\text{DMZJ}}$

Answer: DMZJ.