Discussion
Which one set of letters when sequentially placed at the gapes in the given letter series shall complete it?
a _ ab _ baa _ bb _
Answer: B
The letters are abab.
Filling the gaps in order gives
a a a b b b a a a b b b
which is the block aaabbb written twice: three a's, three b's, three a's, three b's.
The other choices break the repetition. cbbb and accb bring in a c, which appears nowhere else in the series, and bacb also brings in a c, breaking the runs of a's and b's.
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