Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

aab _ aa _ bbb _ aaa _ bbba
  • 1abba
  • 2baab
  • 3aaab
  • 4abab
Answer:- 1
Explanation:-

Solution:
The series is,
aabb / aaabbb / aaaabbbb / a.
Thus letters are repeated twice, then thrice then four times and so on.

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