Which one set of letters when sequentially placed at the gaps in the given letter
series shall complete it ?
a _ ca _ ca _ caa _
When we sequentially fill "cacc" in the gaps we get
a c ca a ca c caa c
When we split the sequence as three parts, we get acca , acac and caac.
The first term and the last term have the same first and last letters while the middle term has alternate letters thus forming a pattern.
Hence Option B is the correct answer.
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