In all pairs except (d), first is the founder of second.
All expert ( b) are antonym pairs
In all pairs expert (a) ,first is a type of second.
In all pairs expert (b) , second is the sound made by first.
In all pairs expert (a) , both the word belong to thr same class.
In all pairs expert (C), first is known as the collection of secondA
In all other except (b), second is the organ used by first for its movement.
In all other groups, there is a gap of one letters as in the alphabet between first and third letters.
All others have only one vowel.
All except '18' are square of natural numbers.
(5)2 = 25, (3)2 = 9, (4)2 = 16
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.
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