In this letter group reasoning question, choose the group that does not follow the same vowel consonant starting pattern as the others: IDD, AGG, UTT and REE.

Introduction / Context:
Simple odd one out questions with letter groups often involve checking whether each group starts with a vowel or a consonant, or whether the letters follow some repeated pattern. In this problem, you are given four three letter groups, all of which end with double letters. However, the first letters differ in type. Recognising the consistent starting pattern for most options helps you find the odd one out.

Given Data / Assumptions:

• The options are IDD, AGG, UTT and REE.
• We classify vowels as A, E, I, O, U and the remaining letters as consonants.
• We are looking for the group that does not share the same starting letter type as the others.

Concept / Approach:
Notice that all groups have the structure consonant or vowel followed by a double consonant or double vowel. The repeated letters at the end are common, so the main difference arises from the first letter. The standard approach is to check whether that first letter is a vowel or a consonant. If three groups start with vowels and one starts with a consonant, the consonant starting group becomes the odd one out.

Step-by-Step Solution:
Step 1: For IDD, the first letter I is a vowel. D and D are consonants, but the starting letter is vowel. Step 2: For AGG, the first letter A is a vowel. G and G are consonants, with a vowel at the beginning. Step 3: For UTT, the first letter U is a vowel. T and T are consonants, again giving a vowel at the start. Step 4: For REE, the first letter R is a consonant. E and E are vowels. Here, unlike the others, the group starts with a consonant. Step 5: Therefore IDD, AGG and UTT start with vowels, while REE starts with a consonant. So REE is the odd one out.

Verification / Alternative check:
We can label each group with V for vowel and C for consonant at the start. That gives IDD = VCC, AGG = VCC, UTT = VCC and REE = CVV. Three groups share a VCC pattern and one group has CVV. The different starting pattern of REE confirms that it is uniquely different from the other three options.

Why Other Options Are Wrong:
IDD is wrong as the odd one out because it begins with the vowel I, matching the starting pattern of AGG and UTT. AGG is wrong as the odd one out because it begins with the vowel A, like IDD and UTT. UTT is wrong as the odd one out because it begins with the vowel U and fits the dominant pattern.

Common Pitfalls:
Some students may be distracted by the double letters at the end and think that this repetition is the key pattern, but since all four groups have repetition, it does not differentiate them. Another mistake is not confirming vowel or consonant status carefully and misclassifying letters. A quick mental check using A, E, I, O, U as vowels avoids such confusion.

Final Answer:
The only letter group that starts with a consonant rather than a vowel, and therefore the odd one out, is REE.