Which of the following can be used to avoid duplicate

Find the missing number, in the given number series.

6, 12, 36, ?, 720, 4320

In each of the following number series, one term is missing. Find the missing term.

4, 9, 16, 25, 36, ?

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

120, 130, ?, 140, 100, 150

250     25      5      ?      0.6       0.3

52, 77, 127, ?, 302, 427

42, 48, 60, 84, 132, ?

1595, 1083, 740, 524, 399, ? 

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

80, 83, 88, 95, 106, ?

25, ?, 87, 159, 269, 425