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?

3 22 ? 673 2696 8093 

What value will come in the place of question mark in the following number series?
5 9 36 208 1398 ? 

Complete the following number series.
6, 10, 18, 34 ?

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

Complete the following series.
12, 8, 14, 6, 16, ?

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

There are 4 friends A, B, C and D standing in a straight line, though not necessarily in the same order. A and B are ahead of at least 1 person. B stands between C and D. D does not stand last. Who stands first?