Discussion
Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series. _ b b c _ d e a _ b _ a d e _ b b _ a d e a _ b c a _ e a b b _ a _ e
Answer: D
The blanks are filled with a, a, b, c, a, c, b, d, c, d (option D). The series is the seven-letter block abbcade repeated. Writing the given series with the blanks filled in this way gives abbcade abbcade abbcade abbcade abbcade, and every printed letter agrees with it: the first blank takes a to start the block, the second takes a, and so on through the string.
Option A starts with c, which would make the first block cbbc..., not matching the b b c after it, and options B and C fail at the first or second blank in the same way, because the letters after each blank (b b c, d e a) fix the block abbcade. Only the sequence a, a, b, c, a, c, b, d, c, d completes all five repeats.
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