Except option (d), sum of all other letters given is equal to 27. And given number represents the possition of lst letters .
In all other groups, there is a gap of two letters as in the alphabet between second and third letters.
In all other groups, there is a gap of two letters as in the alphabet between third and fourth letters.
The pattern used for classification is placement of alphabets in the order (- 3, - 3, - 3). Since, option (b) dose not follow the pattern, it is odd in the group.
All others have two vowels.
Expect B, all are the vowels.
Except 'PRU', all others having same gap but 'PRU' is not following the same rule.
Except (d), all three are same because in those three options first and fourth, second and third are opposite letters.
In all other groups, the second and first letters are three steps ahead of third and second letters, respectively.
In all other groups, the third and first letters are in alphabetical order
In all other groups, there is a gap of one letters as in the originaly alphabet between second and fourth letters.
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