निम्नलिखित

25, 30, 50, 60, 80, ? 

Find the missing number, in the given number series.

60, 150, ?,  450, 450, 225

18, 54, ? , 1890, 17010, 187110

60, 100, 160, 240, ?, 460

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

168, 120, ?, 48, 24, 8

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

60, 94, 184, 464, 1388, ?

114, 146, 210, 306, 434, ?

143        119      107      101       98      ?

124, 180, 108, 198, ?, 220

204, ?,  120, 83, 52, 23