Which of the following is a characteristic of

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

960, 960, 480, ?, 40, 8

135, 148, ?, 184, 207, 236

100, 120, 260, ?, 3220, 16120

945, 1890, ?, 504, 144, 32

84, 105, ?,  168, 210, 259

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

17, 138, 307, 532, ?, 1182

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

?, 65, 37, 73, 29, 81

114, 156, ?,  238, 274, 304

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

4000, ?, 320, 192, 153.6, 153.6

24, 8, 15, ?, 12, 4