Odd One Out (SSC CGL 2019 Tier – 1)

The pattern followed here is :

{2^nd letter = opposite of 1^st letter}

GT → (G ↔ T)

AZ → (A ↔ Z)

LO → (L ↔ O)

But,

KN → (K ↔ P ≠ N)

Hence, "KN" is the odd one.

The product of digit of 1^st number = 2^nd number 

(76 : 42) → (7 × 6) = 42

(55 : 25) → (5 × 5) = 25

(44 : 16) → (4 × 4) = 16

But,

(28 : 56) → (2 × 8) = 16 ≠ 56

Hence, "(28 : 56)" is the odd one.