What will come in place of question mark (?)?

$1598, 798, 398, 198,?, 48$

What will come in place of question mark (?)?

$5,10,15, 20, 25,?$

What will come in place of the question mark?

$2, 14, 84, 420, 1680, 5040,?$

What will come in place of the question mark?

$3, 5, 8, 13, 21, 34, ?$

What value should come in place of the question mark(?) in the following questions? 

$1, 2, 6, 21,?, 445, 2676$

What value should come in place of the question marks(?) in the following question?

$27,125,?,729,1331, 2197, 3375$

What value should come in place of the question mark(?) in the following question?

$3, 6, 12, 24, 48, 96, ?$

What value should come in place of the question mark(?) in the following questions?

$7, 26, 63, 124, 215, ?$

What value should come in place of the question mark(?) in the following questions?  

$3, 19, 115, 691,?, 24883$