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

a_bbc_aab_cca_bbcc
  • 1bacb
  • 2acba
  • 3caba
  • 4abba
Answer:- 1
Explanation:-

Solution:
The pattern is,
aabbccaabbccaabbcc.
The pattern aabbcc is repeated.

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