Directions: The following number series are based on a certain pattern. One number out of all is incorrect and does not follow the pattern. Find that odd one out.

1. 1000, 995, 999,9 80, 950, 830
   1000
   995
   999
   980
   950
   Option C
   1000 .. 995 .. 990 .. 980 .. 950 830

   – 5 .. 5 .. 10 .. 30 .. 120

   ….x 1 .. 2 .. 3 .. 4
   

    

2. 20, 25, 31.1, 38.4, 40, 57
   20
   25
   40
   57
   31.1
   Option C
   20 …. 25 …. 31.1 …. 38.4 …. 47 …. 57

   ……+ 5 …. 6.1 …. 7.3 …. 8.6 …… 10

   ………. + 1.1 …. 1.2 …. 1.3…. 1.4
   

    

3. 200, 184,164, 135, 90, 40
   200
   184
   164
   90
   20
   Option E
   200 184 164 135 90 20

   – 16 20 29 45 70

   + 2^2 3^2 4^2 5^2
   

    

4. 1, 1, 5, 70, 2000, 115500
   1
   5
   70
   2000
   115500
   Option D
   1 1 5 70 2100 115500

   x 1 5 14 30 55

   + 2^2 3^2 4^2 5^2
   

    

5. 15, 25, 36, 52, 70, 115
   15
   25
   36
   52
   70
   Option E
   15 25 36 52 77 115

   + 10 11 16 25 38

   + 1 5 9 13
   

    

6. 30, 31, 36, 41, 56, 87
   30
   31
   36
   41
   56
   Option C
   30 31 34 41 56 87

   + 1 3 7 15 31

   + 2^1 2^2 2^3 2^4
   

    

7. 300, 245 , 190, 160, 150, 175
   300
   245
   190
   160
   150
   Option C
   300 245 195 160 150 175

   – 55 50 35 10 -25

   -5 15 25 35
   

    

8. 10, 13, 21, 47, 84, 155
   10
   13
   21
   47
   84
   Option D
   10 13 21 42 84 155

   + 3 8 21 42 71

   + 5 13 21 29

   + 8 8 8
   

    

9. 20, 24.5, 30.5, 39.5, 53.5 , 72.5
   53
   20
   30.5
   24.5
   39.5
   Option A
   20 24.5 30.5 39.5 53 72.5

   + 4.5 6 9 13.5 19.5

   +1. 5 3 4.5 6

   + 1.5 1.5 1.5
   

    

10. 14, 34, 64 , 124, 262
    14
    34
    64
    124
    262
    Option D
    + 14 34 64 122 262

    + 20 3 0 58 140

    + 1+3^2 1+3^3 1+3^4