In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
a _ bc _ a _ bcdabc _ da _ cd _
acbddb
adbcbd
cabddc
ddcbbc
B.
adbcbd
The correct answer is 'adbcbd'
(aabcd) (abbcd) (abccd) (abcdd)
