Choose the correct alternative to complete the series: $...bcdbc...dcabd....bcdbc....dc....bd$

Study the following arrangement carefully and answer the questions given below:

$7, R,E,T ,4 ,A ,9 ,\% ,D,F, 1, U, \# ,B ,@ ,8 ,H,I ,$©$, W,M, \star, 3,2 ,V ,\$ ,5 ,N,P,6, Q$

How many such vowels are there in the above arrangement, each of which is immediately followed by a symbol?

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

$J ,\star, R, 3, P,L ,2 ,\# ,I,N, 7, O,C, @ ,K, 5, D, =, M, \$, 6, B, > ,A ,Q ,4$

How many such numbers are there in the above arrangement which are not immediately followed by a symbol and also are immediately preceded by a consonant?

Study the following arrangement carefully and answer the question.
$O, 4, E, J, 5, T, 1, A, M, Q, 3, 8, N, I, K, 7, W, F, 6, S, 9, U, 2, Y, X$
Which of the following is exactly in the middle between $A$ and $S$ in the above arrangement?

Find out the missing letters for the given series from the given alternatives.
$....aba.....cabc....dcba......bab.....a$

Find out the wrong term from the given series: $3, 10, 27, 4, 16, 64, 5, 25, 125$.