Which element is represented by the symbol 'Fe' in the

Find the wrong number in the given number series.

21, 31, 11, 41, 1, 61

Find the wrong number in the given number series.

18, 40, 60, 132, 202, 408

5, 6, 8, 16, 38, 158

Find the wrong number in the given number series.

63, 66, 57, 75, 51, 81

 7        12         33        126        635     

12, 10, 23, 65, 265, 1289 

169, 224, 293, 385, 497, 629

Find the wrong number in the given number series.

127, 296, 585, 908, 1475, 2316

21           32           54           86           131         186