In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.
ab _ aa _ bbb _ aaa _ bbba
Option:
A. abba
B. baab
C. aaab
D. abab
Answer: B . baab
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Justification:
The series is abb / aaabbb / aaaabbbb / a.
Thus, the letters are repeated twice, then thrice, then four times and so on.
