Choose the correct alternative answer

$m....nm....n.....an.....a....ma.....$

Study carefully the following arrangement of letters, digits and symbols to answer these

questions.

$M, 7 ,\&, 8, L ,P ,@ ,Q ,N ,\beta ,T ,Y ,3 ,2 ,= ,E ,\$ ,4 ,9 ,\#, G ,H ,5$

How many such symbols are there in the arrangement each of which is immediately preceded by a number?

Fill in the blank space for the given series with the correct alternative.
$1, 3, 4, 8, 15, 27, (\dots)$

Choose the correct alternative for the missing terms in the series: $R, M, ?, F, D, ?$

Choose the correct alternative for the missing term in the series: $shg, rif, qie, pkd, ?$

Find out the wrong term from the given series.
$46080, 3840, 384, 48, 24, 2, 1$