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

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

KC – PT

B.

​IA – NR

C.

BT – GK

D.

DV – IN

Correct option is D

Lets analyze options;
Logic: 1st + 5 = 3rd, 2nd + 17 = 4th
(A) KC – PT
K + 5 = P
C + 17 = T
(B) IA – NR
I + 5 = N
A + 17 = R
(C) BT – GK  
B + 5 = G
T + 17 = (20 + 17 - 26 = 11) K 
(D) DV – IN
D + 5 = I
V + 17 = (22 + 17 - 26 = 13)\neq N
So, DV – IN  is odd one out.
Thus, correct option is (d).

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