Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series.
ab_ba_babd_acb_bdba_b
Total 21 letters are there we will make the group of 7 letters
and the we will put the options in the gap and check the series.
So, when we put options A letter in the gap then it is completing the series
(a b d b a c b) (a b d b a c b) (a b d b a c b)
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