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Which sequence of letters when placed at the blanks one after another will complete the given letter series?
aa – bb – aa – abbbb – a
a a b b / b b a a / a a b b / b b a a.
ba _ b _ aab _ a _ b
c _ bba _ cab _ ac _ ab _ ac
aab – cc – daa – bbb – ccddd
a a b b c c d d / a a a b b b c c c d d d
abca — bcaab — ca — bbc — a
The series is abc/aabc/aabbc/aabbcc/a.
b — b — bb — bbb — bb — b
The series is babb/bbab/bbba/bbbb.
Thus, in each sequence, ‘a’ moves one step forward and ‘b’ takes its place and finally in the fourth sequence, it is eliminated.