Tick the number that will come next in the following sequence:
$4, 6, 12, 14, 28, 30, (\ldots)$

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

Choose the correct alternative to complete the series: $....be...bb....aabc$

Study of the following arrangement carefully and answer the questions given below.

$Q,E ,* ,P,M ,8 ,R,A ,@ ,C ,9 ,U,H,W, \# ,J,Z, ,S, \beta, Y,N ,5 ,\$ ,G,I,T$

What should come in place of the question mark $(?)$ in the following series based on the above arrangement?

$QP@,MAH,@YZ,?$

How many such pairs of digits are there in the number $947863512$,each of which has as many digits between them in the number as they have between them when arranged in descending order?

If the digits of the number $5726489$ are arranged in ascending order,how many digits will remain at the same position?