Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
_ bc _ efa _ cd _ fa _ c _ ef _ bc _ ef
1
abbebdad
2
adbebbad
3
adbebdad
4
addebdad
Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
_ bc _ efa _ cd _ fa _ c _ ef _ bc _ ef