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					 Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
 aac_bba_cc_baa_cb_
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                        - abaac
- cabcb
- bcacb
- bacbc
 
Correct Option: B
The given letter series in below pattern.
a a c c 
After completing the pattern, we will get complete letter series.
a a c c /b b a a /c c b b/a a c c/b b
 
	