Question

Select the letter-cluster from among the given options that can replace the question mark （？） in the following series： PCHJ, PGPV, PKXH, POFT, ?

• A. PSNF
• B. PRPG
• C. PSOF
• D. PSMF

Answer 1

Answer:

A. PSNF

Analyze each position separately:

Position	1st	2nd	3rd	4th	Next
1st letter	P	P	P	P	P
2nd letter	C	G	K	O	S (+4 each time)
3rd letter	H	P	X	F	N (+8 each time, wrapping after Z)
4th letter	J	V	H	T	F (+12 each time, wrapping after Z)

So the missing letter-cluster is:

PSNF

Answer: PSNF