## Number Series

#### Number Series

Direction: In the following number series only one is wrong. Find out the wrong number.

1. 7, 4, 5, 9, 20, 51, 106.5
1. 4
2. 5
3. 9
4. 20
5. 51

1. The series is x 0.5 + 0.5, x 1 + 1, x 1.5 + 1.5. x 2 + 2, x 2.5 + 2.5, x 3 +3

##### Correct Option: E

The series is x 0.5 + 0.5, x 1 + 1, x 1.5 + 1.5. x 2 + 2, x 2.5 + 2.5, x 3 +3

1. 18, 20, 23, 32, 48, 73, 109
1. 20
2. 23
3. 32
4. 48
5. 73

1. The series is 18 +12 = 19; 19 + 22 = 23; 23 + 32 = 32;
32 + 42 = 48; 48 + 52 = 73 + 62 = 109

##### Correct Option: A

The series is 18 +12 = 19; 19 + 22 = 23; 23 + 32 = 32;
32 + 42 = 48; 48 + 52 = 73 + 62 = 109

1. 3, 7, 16, 35, 72, 153, 312
1. 7
2. 153
3. 35
4. 72
5. 16

1. The series is x 2 + 1, x 2 + 2, x 2 + 3, x 2 + 4, x 2 + 5

##### Correct Option: D

The series is x 2 + 1, x 2 + 2, x 2 + 3, x 2 + 4, x 2 + 5

1. 2, 7, 30, 138, 524, 1557, 3102
1. 7
2. 30
3. 138
4. 524
5. 1557

1. (2 - 1) x 7 = 7; (7 - 2) x 6 = 30; (30 - 3) x 5 = 135; (135 - 4) x 4 = 524;
(524 - 5) x 3 = 1557; (1557 - 6) x 2 = 3102

##### Correct Option: C

(2 - 1) x 7 = 7; (7 - 2) x 6 = 30; (30 - 3) x 5 = 135; (135 - 4) x 4 = 524;
(524 - 5) x 3 = 1557; (1557 - 6) x 2 = 3102

1. 6, 10, 14, 34, 66, 130, 258
1. 10
2. 14
3. 34
4. 66
5. 130

1. The series is x 2 - 2, x 2 - 2, x 2 - 2, x 2 - 2, ......

##### Correct Option: B

The series is x 2 - 2, x 2 - 2, x 2 - 2, x 2 - 2, ......