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

Fill in the blank space for the given series with the correct alternative: $2, 6, 12, 20, 30, ?$

These questions are based on the following set of numbers.
$389, 476, 635, 847, 568$
If in all the numbers the first two digits are interchanged and then the numbers are arranged in ascending order,which number will be the second?

Choose the correct alternative for the missing term.
$AB, DEF, HIJK, ?, STUVWX$

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

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

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

How many such numbers are there in the following series,each of which is immediately preceded by $6$ but not immediately followed by $4$?
$3, 8, 6, 8, 4, 2, 6, 9, 8, 4, 6, 8, 4, 8, 6, 2, 6, 8, 4, 8$