The logic followed here is: The first and fourth letters are coded as the opposite letter, the second and fifth letters are coded as the immediate succeeding letter, the third and sixth letters are coded as the third preceding letters as per the English Alphabetical series. 
If  2  4  6  x  14  28  30
Then, x³+ 2 x+1 = ?
16, 54, 128, ‘?’, 432,686
Direction: Which of the following will replace ‘?’ in the given question?
2, ‘?’, 46, 136, 311, 605, 1086
Choose the correct alternative
21: 3 ∷ 574: ?
100, 110, ?, 171.6, 240.24, 360.36
3 5 7 25 85 481
...18Â Â Â Â Â Â Â Â Â Â 434Â Â Â Â Â Â Â Â 642Â Â Â Â Â Â Â Â 746Â Â Â Â Â Â Â Â 798Â Â Â Â Â Â Â Â ?
...Identify the logic of the below given series and given answer.
Series I :: 81, 89, 116, 241, (A), 1915
Series II :: (B), 204, 208, ...
18Â Â Â 19Â Â Â Â 28Â Â Â Â 53Â Â Â 102Â Â Â ?
5Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 6Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 14Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â...
