Which of the following groups of letters when sequentially placed from left to right will complete the given series?
abb_abbcabbcabbca_bcabbca_ bc_bbc
1
aabb
2
cbba
3
abcd
4
cdba
Which of the following groups of letters when sequentially placed from left to right will complete the given series?
abb_abbcabbcabbca_bcabbca_ bc_bbc