All others first and last two digits are same.
This is the only complete square in the group.
This is the only non-square number in the group.
All others are complete squares.
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.
Except '64,73', all are having difference of 11.
In all others, 2nd number is 2 more than the first.
In all others, 2nd number = 1st number + 6
In all other, 2nd number = 1st number/3
In all other numbers the sum of the digits is 17.
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