Direction: Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.
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a _ aa bb _ _ ab _ b _.
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- b a a a a
- b a b a b
- b a a b a
- b b a a a
Correct Option: C
As per given question, the letter series is following the below pattern.
a b
After using the pattern the complete letter series will be as below.
a b / aa bb / a aa b b b / a
