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

_ bc _ ca _ aba _ c _ ca

  • 1abcbb
  • 2bbbec
  • 3bacba
  • 4abbec
Answer:- 1
Explanation:-

Solution:
The series is abc/bca/cab/abc/bca, Thus, the letters change places in a cyclic order.

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