Which letter(s) in the given series is wrong or misfit?

B E I N S A I

Which letter(s) in each of the following series is wrong or misfit in the series?

Z, T, P, K, H, F.

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.

ba____cb____b____bab____

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.

c___bba___cab___ac___ab___ac

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.

ab__ __ baa__ __ ab __

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.

__ bc __ ca __ abc __ c __ ca

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.

ab __ aa __ bbb __ aaa __ bbba

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

$3, 9, 27, 81, 243, ?$

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

$1, 6, 12, 19, 27 ?$