4867 ? 4 + 8 + 6 + 7 = 25, which is divisible by 5.
5555 ? 5 + 5 + 5 + 5 = 20, which is divisible by 5.
6243 ? 6 + 2 + 4 + 3 = 15, which is divisible by 5.
6655 ? 6 + 6 + 5 + 5 = 22, which is not divisible by 5.
All except '18' are square of natural numbers.
(5)2 = 25, (3)2 = 9, (4)2 = 16
All others have only one vowel.
In all other groups, there is a gap of one letters as in the alphabet between first and third letters.
In all other except (b), second is the organ used by first for its movement.
In all pairs except (d), first is the founder of second.
All others are complete squares.
All others are prime numbers.
All others are prime numbers.
All others are divisible by 3.
All others have only 3 factors.
12 = 2 x 2 x 3, 28 = 2 x 2 x 7, 52 = 2 x 2 x 13
68 = 2 x 2 x 17, 96 = 2 x 2 x 2 x 2 x 2 x 3
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