Find the wrong number in the series-

2880, 480, 92, 24, 8, 4, 4

In the following question, select the number which can be placed at the sign of question mark (?) from the given alternatives.
2460, 3570, 4680, ?

Choose the correct alternative from the given ones that will complete the given sequence.
1.5, 2.3, 3.1, 3.9, ?

What will come in place of question mark(?) in the following number series?
119 , 131, 155, 191, 239, (?)

Direction : In the following question, select the correct answer from the given alternatives.
2, 8, 16, 128, ?

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

17 52 158 477 ? 4310 

Find the missing number?
2, 12, 30, ?, 90, 132

What will be come in place of question mark(?) in the following number series?
3, 22, ? , 673, 2696, 8093