Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.
ab_ _ _cba_ _ _dd_ _ _abcd_ _baa_ _ _ _cba
By Trial and Error method,
Option A
ababecba | aacdddec | abcddeba | aecddcba
The above letters do not form a series. Hence option A is incorrect.
Option B
abacbcba | decdddea | abcdacba | aecddcba
The above letters do not form a series. Hence option B is incorrect.
Option C
abcddcba | abcddcba |abcddcba | abcddcba
The above letters form a series.
Hence, the correct answer is Option C
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