Find the odd number from the alternatives given below:

2605

The correct answer is Option (3) → 2605

To find the odd number among the alternatives, we can check the sum of the digits for each number:

• 3207: $3 + 2 + 0 + 7 = \mathbf{12}$
• 1308: $1 + 3 + 0 + 8 = \mathbf{12}$
• 4026: $4 + 0 + 2 + 6 = \mathbf{12}$
• 2605: $2 + 6 + 0 + 5 = \mathbf{13}$

Conclusion:

The sum of the digits for the first, second, and fourth options is 12. However, the sum of the digits for 2605 is 13, making it the odd one out.