Direction (66-70): What should come in place of the question mark(?) in the following number series?

7, 8 , 17, 42, ?

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

15     19    83   119     631     (?)

What will come in place of question mark ( ? ) in the following series?
656, 352, 200, 124, 86, ? 

What will come in place of question mark(?) in the following number series?
11, 57, 149, 333, 701 (?)

Directions : What should come in place of the question mark (?) in the following number series? 

7 17 54 ? 1098 6591 

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

15     18    16   19     17    20    ?

Directions : What should come in place of the question mark (?) in the following number series? 

55 109 ? 433 865 1729 

Directions : What should come in place of the question mark (?) in the following number series? 

87 89 95 107 ? 157