Fill in the blank space for the given series with the correct alternative.
$1, 2, 3, 6, 9, 18, (...), 54$

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 digits in the arrangement are removed, then which of the following will be the $8^{th}$ to the right of the $15^{th}$ element from the right end?

Fill in the blank space for the given series with the correct alternative.
$2, 3, 8, 63, (\ldots)$

Find out the wrong term from the given series:
$3, 7, 15, 39, 63, 127, 255, 511$

Which one of the following is the correct order of missing letters in the series given below?
$....sttt...tt...tts....$

Choose the correct alternative for the missing terms in the sequence: $Z, L, X, J, V, H, T, F, ?, ?$