Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
_ d _ a c _ _ a _ d b _ c d _ _
1
a b c d a b c d
2
b c a b c a d a
3
c b d b c a b a
4
b a b a c d c d
Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
_ d _ a c _ _ a _ d b _ c d _ _