In the following question, select the odd number from the alternatives given below. One of the numbers has a different digit-length (number of digits) compared to the others. Identify the number that does not belong to the same group. (A) 313 (B) 426 (C) 925 (D) 1034 (E) 789

Introduction / Context:
This odd-one-out question tests quick classification of numbers by a simple visible property. In aptitude, the simplest grouping is often by digit count (3-digit vs 4-digit), even before checking deeper divisibility or prime properties. The odd number will be the one that differs in digit length from the rest.

Given Data / Assumptions:

• A 3-digit number ranges from 100 to 999.
• A 4-digit number ranges from 1000 to 9999.
• We count digits directly for each option.

Concept / Approach:
Count the number of digits in each option. If most numbers have the same digit count and one has a different digit count, that different one is the odd number.

Step-by-Step Solution:

Verification / Alternative check:
A fast check is to note that only 1034 is greater than or equal to 1000, automatically making it a 4-digit number. The remaining options are all less than 1000 and therefore 3-digit numbers. This confirms the classification difference without any calculation.

Why Other Options Are Wrong:

Common Pitfalls:
Some students overthink and start checking primes, palindromes, or divisibility rules. While those can be useful in some problems, here the most obvious and intended pattern is digit length. Another mistake is overlooking that 1034 crosses the 1000 boundary. Always test the simplest property first.

Final Answer:
1034