If the following set of letters are sequentially placed at the gaps in the given letter series, then which one will complete the series?
a_ _bba_cb_ab_bb1
bcbbc
2
bcaab
3
aacbc
4
abaca
If the following set of letters are sequentially placed at the gaps in the given letter series, then which one will complete the series?
a_ _bba_cb_ab_bb