This question was previously asked in

AP SET 2018 Paper 1 (General Paper)

Option 4 : 356

Here the logic is:

The addition of first and second digits is equal to the third digit of a number.

639 = (Addition of first digit) + (Addition of second digit) = (Third digit of a number)

= 6 + 3 = 9

527 = (Addition of first digit) + (Addition of second digit) = (Third digit of a number)

= 5 + 2 = 7

426 = (Addition of first digit) + (Addition of second digit) = (Third digit of a number)

= 4 + 2 = 6

But in option 4 -

356 = (Addition of first digit) + (Addition of second digit) ≠ (Third digit of a number)

= 3 + 5 ≠ 6

Hence, '356' is the correct answer.