Understanding the Letter Series Problem

The question asks us to find the correct sequence of letters to fill in the blanks of a given letter series, thereby completing the pattern.

The given series is: A _ _ O U A E I _ _ A _ I _ U A E _ O _

There are 8 blanks represented by underscores (_) in the series. We need to determine the correct 8-letter combination to fill these blanks sequentially.

Analyzing the Series Pattern

Let's identify the fixed letters and the positions of the blanks in the series:

Series Structure (Total 20 positions):

A _ _ O U A E I _ _ A _ I _ U A E _ O _

• Fixed letters present: A, O, U, A, E, I, A, I, U, A, E, O (Total 12 letters).
• Blank positions (indicated by _): 2, 3, 9, 10, 12, 14, 18, 20 (Total 8 blanks).

The correct answer option provides the sequence EIQUEQIU, which consists of 8 letters. This sequence is intended to fill the 8 blanks in the order they appear.

Constructing the Completed Series

We will now insert the letters from the sequence EIQUEQIU into the blanks based on their positions:

• Position 2 blank is filled with 'E'.
• Position 3 blank is filled with 'I'.
• Position 9 blank is filled with 'Q'.
• Position 10 blank is filled with 'U'.
• Position 12 blank is filled with 'E'.
• Position 14 blank is filled with 'Q'.
• Position 18 blank is filled with 'I'.
• Position 20 blank is filled with 'U'.

After filling the blanks, the complete series reads:

A E I O U A E I Q U A E I Q U A E I O U

Identifying the Pattern Logic

To understand the pattern, let's break down the completed series into logical blocks. We can observe four blocks, each containing 5 letters:

• Block 1 (Positions 1-5): A E I O U
• Block 2 (Positions 6-10): A E I Q U
• Block 3 (Positions 11-15): A E I Q U
• Block 4 (Positions 16-20): A E I O U

From this structure, we can identify the pattern:

• The series starts and ends with the standard sequence of the first five vowels: A, E, I, O, U.
• The middle section consists of two blocks of a variant sequence: A, E, I, Q, U.

The pattern is therefore: (Standard Vowel Sequence) + (Variant Sequence) + (Variant Sequence) + (Standard Vowel Sequence).

The letter 'Q' is part of this specific variant sequence. Identifying this repetition and variation is key to solving the puzzle.

Conclusion on Series Completion

The letter series follows a pattern of repeating blocks, alternating between the standard vowel sequence (A E I O U) and a variant sequence (A E I Q U). The sequence EIQUEQIU correctly fills the blanks to establish this pattern.