In each of the following letter series, some of the letters are missing which are given in that order as one of the alternative below it. Choose the correct alternative.

_aa _ ba _ bb _ ab _ aab

In each of the following letter series, some of the letters are missing which are given in that order as one of the alternative below it. Choose the correct alternative.

ab_ d _ aaba _ na _ abadna _ b

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.

$a \_ n \_ b \_ \_ ncb \_ \_ ncb$

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.

$gfe\_ig\_eii\_fei\_gf\_ii$

Direction: In 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.

a - bbc - aab - cca - bbcc

Direction: 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.

c _ bbb _ _ abbbb _ abbb _

Direction: In the following letter series, some of the letters are missing which are given in that order as one of the alternative below it. Choose the correct alternative.

c- bba - cab - ac - ab - ac

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.

$cccbb\_aa \_ cc \_ bbaa \_c$

In each of the following letter series, some of the letters are missing which are given in that order as one of the alternative below it. Choose the correct alternative.

_ a _ b _ abaa _ bab _ abb