Find the missing letters for the given series from the given alternatives.
$b....b...bb....,.....bbb.....bb....b$

Choose the correct alternative answer

$bca.....b....aabc....a...caa$

Fill in the blank space for the given series with the correct alternative.
$11, 12, 17, 18, 23, 24, (\ldots)$

Study the following arrangement carefully and answer the question.
$O, 4, E, J, 5, T, 1, A, M, Q, 3, 8, N, I, K, 7, W, F, 6, S, 9, U, 2, Y, X$
If all the numbers in the above arrangement are dropped,which of the following will be the ninth to the left of $S$?

Fill in the blank space for the given series with the correct alternative.
$6, 24, 12, (\ldots), 18, 8, 24$

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

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

If the above arrangement is written in reverse order, which element will be eleventh to the left of sixteenth from the left?