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1. Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?
aab _ aa _ bbb _ aaa _ bbba
aabb / aaabbb / aaaabbbb / a.
Thus letters are repeated twice, then thrice then four times and so on.
aab _ aa _ bbb _ aaa _ bbba
Solution:
The series is, aabb / aaabbb / aaaabbbb / a.
Thus letters are repeated twice, then thrice then four times and so on.