Question

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. MNO, OPQ, QRS, ?

• A. RST
• B. RSP
• C. STU
• D. TUV

Answer 1

Answer:

C. STU

The series is:

MNO, OPQ, QRS, ?

Look at the first letter of each cluster:

• M → O → Q → S (increases by 2)

Each cluster contains three consecutive letters:

• MNO

• OPQ

• QRS

• STU

So the missing letter cluster is:

STU

Answer: STU