6 : 210 :: 10 : ?
A900
B990
C996
D999
A900
B990
C996
D999
Related Questions:

വിട്ടുപോയ സംഖ്യ ഏതാണ് ?
Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster.
LEGAL : JCLHD :: LOYAL : ?