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Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which letter-cl
Question

Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which letter-cluster DOES NOT belong to that group?
(Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)

A.

EF

B.

AF

C.

AD

D.

CA

Correct option is A

Checking by all options:
Logic = find adjacent in the alphabetical series.

AI: A and I are not adjacent in the alphabet.
EF: E and F are adjacent in the alphabet.
AD: A and D are not adjacent in the alphabet.
CA: C and A are not adjacent in the alphabet.

Hence option A is correct.

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