Verbal Reasoning - Series Completion

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.

16. 

ab _ aa _ bbb _ aaa _ bbba

A. abba
B. baab
C. aaab
D. abab

Answer: Option B

Explanation:

The series is abb/aaabbb/aaaabbbb/a. Thus the letters are repeated twice, then thrice, then four times and so on.


17. 

_ nmmn _ mmnn _ mnnm _

A. nmmn
B. mnnm
C. nnmm
D. nmnm

Answer: Option C

Explanation:

The series is nnmm/nnmn/nnmm/nnmm. Thus, the pattern 'nnmm' is repeated.


18. 

a _ n _ b _ _ ncb _ _ ncb

A. abbbec
B. abebeb
C. bacbab
D. bcabab

Answer: Option D

Explanation:

The series is abncb/abncb/abncb. Thus, the pattern 'abncb' is repeated.


19. 

a _ ba _ b _ b _ a _ b

A. abaab
B. abbab
C. aabba
D. bbabb

Answer: Option D

Explanation:

The series is abb/abb/abb/abb. Thus, the pattern 'abb' is repeated.


20. 

cccbb _ aa _ cc _ bbbaa _ c

A. aebe
B. baca
C. baba
D. acba

Answer: Option B

Explanation:

The series is ccc bbb aaa/ccc bbb aaa/c. Thus, the pattern ccc bbb aaa is repeated.