Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series.
abc_dab_ _d_b_cdab_c_1
acacdcc
2
cacacdc
3
ccaacdc
4
cccaccd
Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series.
abc_dab_ _d_b_cdab_c_