Find the missing letters for the given series from the given alternatives.
$a....cdaab....cc....daa....bbb......ccddd$

To answer these questions study carefully the following arrangement of letters, digits and symbols.

$6,=,\$, C,E, 3,8 ,G,L,M, 7, \star, @ ,P,R, 4, \# ,N,T, 5, S,V$

If all the symbols in the arrangement are removed, then which of the following will be the $7^{th}$ to the left of the $13^{th}$ element from the left end?

Study the following arrangement carefully and answer the question given below:
$B, 2, I, J, K, 4, 3, H, 5, E, R, P, 6, N, A, 9, W, 8, T, U, 1, V, D, 7, F$
What should come in place of the question mark $(?)$ in the following series based on the given arrangement?
$2J, 4H, EP, ?$

Fill in the blank space for the given series with the correct alternative.
$66, 36, 18, (...)$

Choose the correct alternative for the missing term:
$AZ, CX, FU, ?$

Find out the wrong term from the given series.
$10, 26, 74, 218, 654, 1946, 5834$