Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series.
ab_ba_db_bd_ac_ba_db_cdbabd_
Option D is rightÂ
ab_ba_db_bd_ac_ba_db_cdbabd_
  d  c  a   b  d  b a      b
Observe the letter which i wrote in two lines for your convenience.
You will notice that abdb acdb keeps repeating.
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