Choose the correct alternative for the missing term:
$MHZ, NIW, OKT, PNQ, ?$

Choose the correct alternative for the missing terms in the series: $W, V, T, S, Q, P, N, M, ?, ?$

Find the missing term in the series: $2, 6, 12, 20, 30, ?$

Choose the correct alternative for the missing term in the series: $AZ, BY, CX, ?$

These questions are based on the following arrangement. Study it carefully and answer the questions.

$8 ,H ,\% ,3,7 ,T,A ,4 ,\# ,6 ,B,I ,@ ,R ,1 ,Q ,\star, L,E ,2 ,K ,\$ ,U ,5,9$

What will come in place of the question mark in the following series based on the above arrangement?

$7T3,4\#A,BI6,?$

Choose the correct alternative to fill in the blanks in the series: $abb . . . . baa . . . . a . . . bab . . . . aba$