Which sequence of letters when placed in the blanks one after the other will complete the given letter series ?
ab_aa_bbb_aaa_bbba
A
baab
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B
abab
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C
aaab
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D
abba
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Solution
The correct option is A baab Here, the series is: abb/aaabbb/aaaabbbb/a. Thus, the letters are repeated twice, then thrice and then four times and so on. Hence, option (A) is the correct answer.