6 : 210 :: 10 : ?
A900
B990
C996
D999
A900
B990
C996
D999
Related Questions:
In the given letter-cluster pairs, the first letter-cluster is related to the second letter-cluster following a certain logic. Study the pairs carefully, and from the options, select the pair that follows the same logic.
COWBOY : WOCYOB
TANGLE : NATELG