In this question on verbal reasoning, choose the group of letters that is least like the others: CUD, SIP, SET and NTR.

Introduction / Context:
This odd one out question asks you to compare small groups of letters that also form short everyday English words. Three of the options are meaningful words, while one option is simply a random letter sequence with no meaning. Identifying the meaningful word groups and contrasting them with the meaningless group is a common pattern in verbal reasoning exams and helps to test vocabulary awareness.

Given Data / Assumptions:

• The given options are: CUD, SIP, SET and NTR.
• We assume standard English vocabulary usage.
• The task is to find the option that does not belong with the others on a logical basis.

Concept / Approach:
One familiar approach is to check whether each group of letters forms a valid, commonly used English word. If three items are meaningful words and one is not, the meaningless one will be the odd man out. In verbal odd man out questions, meaning and usability in normal language are usually more important than deep numerical patterns or letter position arithmetic.

Step-by-Step Solution:
Step 1: Check “CUD”. Cud is a real English word, referring to partly digested food that some animals chew again. Step 2: Check “SIP”. Sip is also a real word, meaning to drink something in small quantities. Step 3: Check “SET”. Set is a very common English word with many meanings, such as a group of things, or to place something. Step 4: Check “NTR”. This does not form any standard common English word. It looks like a random combination of letters, unlike the other three which are meaningful words. Step 5: Since CUD, SIP and SET are meaningful words, and NTR is not, NTR is the odd one out.

Verification / Alternative check:
Another quick check is to mentally place each option in a simple sentence. For example, “I took a small sip of tea” and “The teacher gave us a set of questions” are normal sentences. “The cow chewed its cud” is also meaningful. Trying to use “NTR” in a sentence reveals that it is not a word at all. This confirms that NTR does not share the common property of being a proper English word.

Why Other Options Are Wrong:
CUD is not the odd one out because it is a valid English noun referring to food chewed by animals. SIP is not the odd one out because it is a common verb or noun related to drinking. SET is not the odd one out because it is a widely used word with many accepted meanings.

Common Pitfalls:
A common mistake is to start looking for complicated numerical patterns using letter positions in the alphabet without first checking the simple meaning based property. Verbal reasoning questions often rely on everyday vocabulary, so ignoring meaning can waste time. Another pitfall is assuming every group must hide some arithmetic pattern in the letters, which is not necessary here.

Final Answer:
The group of letters that does not form a meaningful word and therefore is the odd one out is NTR.