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In each of the following letter series, some of the letters are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.

abb___baa___a__bab__aba

  • A.abba
  • B.abab
  • C.ccac
  • D.aabb

Answer: A

The missing letters are abba.

Filling the blanks in order with a, b, b, a gives

abba baab ab baba aba = abba baab abba baab a

The series is the block 'abba' followed by its mirror 'baab', repeated. Trying abab or aabb breaks the abba/baab alternation (aabb, for instance, makes the second block baaa), and ccac brings in a letter that does not occur in the series at all.

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