Find the missing number in the following series-

$6, 12, 48 , 264, ?$

Find the missing number in the following series-

$432, 864, 16128, ?$

Find the missing number in the following series-

$668, 288, 128, 16, ?$

Find the missing number in the following series-

$\frac{1}{81 },\frac{1}{54},\frac{1}{36},\frac{1}{24},?$

Find the missing number in the following series-

$2, 6, 11, 17, ?, 32$

Find the missing number in the following series-

 $1, 2, 3, 6, 9, 18, ?, 54$

Find the missing number in the following series- 

$3,7, 15, ?, 63$

Find the missing number in the following series: 

$1,2, 7, 7,13, 12, ?,17$

Find the missing number in the following series- 

$128, 110, 90, ?, 44$