Only 75 is divisible by 15.
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 '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.
Except '841', all are even numbers.
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