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?

Study the following arrangement carefully and answer the questions given below:
$R, 4, E, J, 5, T, 1, A, M, Q, 3, 8, N, I, K, 7, W, F, 6, D, 9, U, 2, Y, V$
Four of the following five are alike in a certain way based on their positions in the above arrangement and so form a group. Which is the one that does not belong to this group?

Choose the correct alternative to complete the series: $aab....aa....bbb....aaa....bbba$

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

Fill in the blank space for the given series with the correct alternative.
$3, 8, 22, 63, 185, (\ldots)$

Which is the number that comes next in the sequence:
$0, 6, 24, 60, 120, 210, ?$