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Directions to Solve

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.

11. 

_ aa _ ba _ bb _ ab _ aab
A. aaabb
B. babab
C. bbaab
D. bbbaa
12. 

c _ bba _ cab _ ac _ ab _ ac
A. abebe
B. acbcb
C. babec
D. bcacb
13. 

ba _ cb _ b _ bab _
A. acbb
B. bacc
C. bcaa
D. cabb
14. 

_ bc _ ca _ aba _ c _ ca
A. abcbb
B. bbbec
C. bacba
D. abbec
15. 

ab _ _ baa _ _ ab _
A. aaaaa
B. aabaa
C. aabab
D. baabb