Choose the set of letters that sequentially completes the following letter series.
_ O P Q N _ P Q N O _ Q N O P _
Show answer & explanation
Correct answer: C
Explanation
The given series has 16 positions (including blanks). We can divide it into 4 groups of 4 letters each:
_ O P Q / N _ P Q / N O _ Q / N O P _
Observing the pattern, each group is the repeating sequence N O P Q:
• 1st group: N O P Q
• 2nd group: N O P Q
• 3rd group: N O P Q
• 4th group: N O P Q
The letters that complete the series sequentially are N, O, P, Q.
Therefore, the correct option is (C).