The Except 64-73 all are having difference of 11.
As, 13 + 7 = 20 ? 20 +7 = 27
Similarly, 18 + 7 = 25 ? 25 + 7 = 32
Except '14, 11 , 13', all remaining options having only even numbers.
In all others, middle number is the sum of other two numbers.
5-2=3, 19-16 =3,27 -23=4, 31-28=3.
Only 'option (d) second number is twice of first number.
Except 210, all other are square of some numbers.
Except 28*, all others are multiples of 3.
In all other numbers, the sum of the first two digits is equal to the third digit.
Except 44, all are prime numbers.
Only 729 is a perfect cube.
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