In the following questions, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.
Expression : adb _ ac _ da_cddcb _ dbc _ cbda
The pattern is that in a group of 4 letters, there is a combination of first four alphabets, i.e. 'a,b,c,d'.
=> adbc acbd abcd dcba dbca cbda
=> Ans - (C)
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