Look carefully for the pattern, and then choose which pair of numbers comes next.

17, 17, 34, 20, 20, 31, 23

What will come in place of question mark (?) in the following number series:

$2, 15, 41, 80, 132, ?$

What will come in the place of the question mark in the given number series:

$0.75, ?, 6, 36, 288, 2880$.

What will come in the place of question mark for the following number series:

$21, 37, 40.2, 88.2, 94.6, ?$.

What should come in place of the question mark for the following question:

$256, ?, 190, 167, 148, 131$

What will come in place of the question mark (?) in the following number series?

$?, 15, 75, 525, 4725, 51975$

What should come in place of the question mark in the following question:

$36, 18, 6, 3, 1, ?$

What should come in place of the question mark in the following question:

$18, 29, 42, 53, ?, 77$

What should come in place of the question mark in the following question:

$18, 8, 6, 9, 32, ?$

What will come in place of the question mark (?) in the following number series:

$48, 23, ?, 4.25, 1.125$

What will come in the place of question mark in the given number series:

$142, 70, 34, 16, ?, 2.5$.

What should come in place of the question mark for the following question:

$1, 244, 163, 190, 181, ?$