The positions of how many digits in the number $7,3,5,4,6,1,2$ will remain unchanged after the digits within the number are rearranged in descending order from left to right?

Fill in the blank space for the given series with the correct alternative.
$1, 2, 6, 24, (...)$

Fill in the blank space for the given series with the correct alternative.
$3, 9, 27, 81, (\ldots)$

How many such digits are there in the number $52361984$ each of which is as far away from the beginning of the number as when the digits are rearranged in ascending order within the number?

Choose the correct alternative for the missing term in the series: $? , ayw, gee, mki, sqo$

To answer these questions study carefully the following arrangement of letters, digits and symbols.

$6,=,\$, C,E, 3,8 ,G,L,M, 7, \star, @ ,P,R, 4, \# ,N,T, 5, S,V$

If all the symbols in the arrangement are removed, then which of the following will be the $7^{th}$ to the left of the $13^{th}$ element from the left end?