30, 42, 54, 66, ?, 90
51    52    48     57    ?      66      30
...Find the missing number, in the given number series.
42, 52, 72, 112, 192, ?
Find the missing number, in the given number series.
360, 322, ?, 252, 220
What will come in place of the question mark (?) in the following series?
34, 61, 7, ?, -20, 115
31    32      35      ?      47       56
...What will come in place of the question mark (?) in the following series?
75, 219, 388, ?, 809, 1065What will come in place of the question mark (?) in the following series?
1458, ?, 162, 54, 18, 6
- What will come in place of the question mark (?) in the following series?
-5, -2, ?, 10, 19, 30 14, 34, 19, 29, 24, ? , 29, 19