Which one of the following is the correct mode of

Find the wrong number in the given number series.

7, 38, 63, 116, 171, 242

6.5, 11, 22, 25.5, 51, 54.5

20000,  500,  25,  2.5,  0.5,  0.4,   0.16

140    150    175     185     210      225     

48, 72, 104, 144, 192, 251 

Find the wrong number in the given number series.

57, 58, 62, 70, 86, 118

15, 30, 30, 20, 10, 8

Find the wrong number in the given number series.

121, 132, 145, 160, 181, 204

Find the wrong number in the given number series.

30, 17, 19, 30.5, 64, 164.5