In all other options, digit in the middle is the sum of the other two digits.
3216 ? 3 + 2 + 6 - 1 = 10;
2338 ? 2 + 3 + 8 - 3 = 10;
3205 ? 3 + 2 + 5 - 0 = 10;
2015 ? 2 + 0 + 5 - 1 = 6
Therefore, 2015is different from the other three.
In all other options, sum of the digits is 20.
Except '841', all are even numbers.
All others are divisible by 13.
In all other options, digit at the second place is the difference from first and third digits.
All others are complete squares.
This is the only non-square number in the group.
This is the only complete square in the group.
All others first and last two digits are same.
Except '64,73', all are having difference of 11.
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