All others are divisible by 7.
All others are divisible by 12.
All others are perfect square of natural number.
? 272 = 2 + 7 + 2 = 11
210 = 2 + 1 + 0 = 3
240 = 2 + 4 + 0 = 6
304 = 3 + 0 + 4 =7
The sum of digit of all numbers except 240 is a prime number, whereas sum of digits of the number 240 is a non-prime. Hence, it is different from all others.
All others are one less then the cube of a number.
Except '44', all are prime numbers.
Only 75 is divisible by 15.
Except '64', none of the numbers is a square or a cube.
Except '87', all a prime numbers 87 is divisible by 3.
In all other options, digit at the second place is the difference from first and third digits.
All others are divisible by 13.
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