NUMBER SERIES  2:

1. 4, 4, 6, 12, 30, ?
   1. 97
   2. 92
   3. 95
   4. 98
   5. 90
   
   Answer – 5. 90
   Explanation :
   4 * 1 = 4
   4 * 1.5 = 6
   6 * 2 = 12
   12 * 2.5 = 30
   30 * 3 = 90
   
   
2. 10 5 5 10 40 ?
   1.350
   2.320
   3.360
   4.370
   5.380
   
   Answer – 2. 320
   Explanation :
   10 * 0.5 = 5
   5 * 1 = 5
   5 * 2 = 10
   10 * 4 = 40
   40 * 8 = 320
   
   
3. 3, 5, ?, 27, 92, 349
   1.12
   2.18
   3.15
   4.10
   5.11
   
   Answer – 4.10
   Explanation :
   3 + 1² + 1 = 5
   5 + 2² + 1= 10
   10 + 4² + 1= 27
   
   
4. 1, 2, 6, 17, ?, 157.5
   1.40.5
   2.42.5
   3.49.5
   4.51.5
   5.50.5
   
   Answer – 3. 49.5
   Explanation :
   1 * 1 + 1 = 2
   2* 1.5 + 3 = 6
   6 * 2 + 5 = 17
   17 * 2.5 + 7 = 49.5
   49.5 * 3 + 9 =157.5
   
   
5. 7, ?, 19, 45, 95, 177
   1.8
   2.5
   3.6
   4.7
   5.9
   
   Answer – 5.9
   Explanation :
   7 + 1² + 1= 9
   9 + 3² + 1= 19
   19 + 5² + 1= 45……..
   
   
6. 9, 8, 15, ?, 175, 874
   1.42
   2.24
   3.38
   4.44
   5.14
   
   Answer – 4.44
   Explanation :
   9*1 – 1 = 8
   8*2 – 1 = 15
   15*3 – 1 = 44
   
   
7. 2, 2, 12, 36, 104, ?
   1.232
   2.221
   3.223
   4.224
   5.242
   
   Answer – 4.224
   Explanation :
   2 + 1³ – 1 = 2
   2 + 2³ + 2 = 12
   12 + 3³ – 3 = 36
   36 + 4³ + 4 = 104
   
   
8. 4, 15, 63, 247, 995, ?
   1.3975
   2.3973
   3.3965
   4.3971
   5.3955
   
   Answer – 4.3971
   Explanation :
   4 * 4 – 1 = 15
   15 * 4 + 3 = 63
   63 * 4 – 5 = 247
   247 * 4 + 7 = 995
   995 * 4 – 9 = 3971
   
   
9. 3, ?, 7, 9, 11, 13
   1.6
   2.5
   3.7
   4.8
   5.9
   
   Answer – 2.5
   Explanation :
   3*2 – 1 = 5
   5*2 – 3 = 7
   7*2 – 5 = 9
   
   
10. 6, 8, 12, 42, 160, ?
    1.870
    2.840
    3.850
    4.810
    5.820
    
    Answer – 4.810
    Explanation :
    6 * 1 + 2 = 8
    8 * 2 – 4 = 12
    12 * 3 + 6 = 42
    42 * 4 – 8 = 160
    160 * 5 + 10 = 810