Select the option that is related to the fifth letter – cluster  in the same way as the second letter – cluster is related to the first letter – cluster and the fourth letter – cluster  is related to the third letter – cluster.
MEK : NVP : : GYT : TBG : : JWH : ? 

Options:
a) QDS
b) PCR
c) QDT
d) PCS

Solution

MEK : NVP : : GYT : TBG : : JWH : ?
13-5-11: 14-22-16 : : 7-25-20 : 20 – 2-7
Group letters are opposite letters to each other
therefore sum total is 27
13 + 14 = 27, 5 + 22 = 27, 11 + 16 = 27
7 + 20 = 27, 25 + 2 = 27, 20 + 7 = 27
same logic apply on JWH – 10 – 23 – 8
27 – 10 = 17 – Q
27 – 23 = 4 – D
27 – 8 = 19 – s

Correct Answer: a) QDS