Four letter – clusters have been given, out of which three are alike in some manner and one is different. Select the letter – cluster that is different.

Option
a) ODS
b) AHI
c) GNU
d) DOU

Solution

O D S = 15 -4 -1 9
A H I = 1 – 8 – 9
G N U = 7 – 14 – 21
D O U = 4 – 15 – 21

Logic Sum of digits of first two letter position = 3rd number position
1 5 + 4 = 19
1 + 8 = 9
7 + 14 = 21
4 + 15 = 19 not 24
DOU is are not a like with other

Answer: DOU