0

Number Series

Description: SSC Reasoning Test
Number of Questions: 15
Created by:
Tags: Number Series
Attempted 0/15 Correct 0 Score 0

Directions: Complete the series.

0, 2, 6, 14, 30, ?

  1. 32

  2. 34

  3. 38

  4. 46

  5. 62


Correct Option: E
Explanation:

From the given series, it is clear that every term is added to the increasing powers of 2 to get the next term.

0 + 2= 2 2 + 2= 6 6 + 2= 14 14 + 2= 30 Similarly, 30 + 2= 62

Directions: Complete the series.

60, 30, 10, 5, 5/3, ?

  1. 5/6

  2. 5/9

  3. -85/3

  4. -55/3

  5. -10/3


Correct Option: A
Explanation:

From the series, it is clear that every term of the series is multiplied by either 1/2 or 1/3 to get the next term.

60 * 1/2 = 30 30 * 1/3 = 10 10 * 1/2 = 5 5 * 1/3 = 5/3 Similarly, (5/3) * (1/2) = 5/6

Directions: Complete the series.

2, 11, 23, 31, 41, ?

  1. 50

  2. 51

  3. 49

  4. 53

  5. 206


Correct Option: D
Explanation:

From the series, it is clear that every term is the first prime number in its group, starting from 1 to 10. 2 is the first prime number between 1 to 10. 11 is the first prime number between 11 to 20. 23 is the first prime number between 21 to 30. 41 is the first prime number between 41 to 50. Similarly, 53 is the first prime number between 51 to 60.

Directions: Complete the series.

100, 50, 25, 12.5, ?

  1. 6.5

  2. 6

  3. -37.5

  4. -12.5

  5. 6.25


Correct Option: E
Explanation:

From the series, it is clear that every term of the series is subtracted by its half to get the next term.

100 - (100/2) = 50 50 - (50/2) = 25 25 - (25/2) = 12.5 Similarly, 12.5 - (12.5/2) = 6.25

Directions: Complete the series.

121, 144, 169, 196, ?

  1. 225

  2. 219

  3. 221

  4. 223

  5. 256


Correct Option: A
Explanation:

From the series, it is clear that every term is the square of the consecutive terms.

11= 121, 12= 144, 13= 169, 14= 196. Similarly, 15= 225.

Directions: Complete the series.

100, 50, 50/3, 25/6, ?

  1. 25/12

  2. 5/6

  3. -275/6

  4. -25/3

  5. 25/18


Correct Option: B
Explanation:

From the series, it is clear that the terms are divided by consecutive numbers.

100/2 = 50, 50/3 = 50/3, (50/3)/4 = 25/6. Similarly, (25/6)/5 = 5/6.

Directions: Complete the series.

1, 4, 8, 32, 64, 256, ?

  1. 512

  2. 1024

  3. 259

  4. 260

  5. 280


Correct Option: A
Explanation:

From the series, it is clear that every term is multiplied by either 4 or 2 to get the next term.

1 * 4 = 4, 4 * 2 = 8, 8 * 4 = 32, 32 * 2 = 64, 64 * 4 = 256. Similarly, 256 * 2 = 512.

Directions: Complete the series.

1, 2, 5, 11, 21, ?

  1. 36

  2. 31

  3. 27

  4. 24

  5. 22


Correct Option: A
Explanation:

From the series, it is clear that successive terms of the series are added to 1, 1 + 2, 1 + 2 + 3..... to get the next terms in the following way:

1 + 1 = 2

2 + (1 + 2) = 5  

5 + (1 + 2 + 3) = 11  

11 + (1 + 2 + 3 + 4) = 21  

Similarly, 21 + (1 + 2 + 3 + 4 + 5) = 36

Directions: Complete the series.

1, 2, 4, 10, 34, ?

  1. 154

  2. 35

  3. 68

  4. 40

  5. 106


Correct Option: A
Explanation:

From the series, it is clear that every term is added to factorials of successive natural numbers.
 
1 + 1 * 1 = 2

2 + 1 * 2 = 4  

4 + 1 * 2 * 3 = 10  

10 + 1 * 2 * 3 * 4 = 34  

Similarly, 34 + 1 * 2 * 3 * 4 * 5 = 34 + 120 = 154

Directions: Complete the series.

5, 13, 37, 109, ?

  1. 325

  2. 117

  3. 118

  4. 221

  5. 229


Correct Option: A
Explanation:

From the series, it is clear that every term is operated with the logic (3n - 2) to get the next term.

5 * 3 - 2 = 13, 13 * 3 - 2 = 37, 37 * 3 - 2 = 109

Similarly, 109 * 3 - 2 = 325.

Directions: Complete the series.

1, 3, 9, 21, 41, ?

  1. 71

  2. 43

  3. 61

  4. 123

  5. 81


Correct Option: A
Explanation:

From the series, it is clear that every term is added to 1 * 2, 2 * 3, 3 * 4..... as follows:

1 + 1 * 2 = 3, 3 + 2 * 3 = 9, 9 + 3 * 4 = 21, 21 + 4 * 5 = 41

Similarly, 41 + 5 * 6 = 71.

Directions: Complete the series.

0, 5, 30, 35, 60, 65, ?

  1. 70

  2. 390

  3. 90

  4. 120

  5. 105


Correct Option: C
Explanation:

From the series, it is clear that every term is added to either 5 or 52 to get the next term.

0 + 5 = 5 (second term)  

5 + 5= 30 (third term)  

30 + 5 = 35 (fourth term)  

35 + 5= 60 (fifth term)  

60 + 5 = 65 (sixth term)  

Similarly, 65 + 5= 90

Directions: Complete the series.

6, 10, 26, 30, 46, 50, ?

  1. 54

  2. 66

  3. 98

  4. 106

  5. 86


Correct Option: B
Explanation:

In the series, it is clear that every term is added to either 4 or 42 to get the next term.

6 + 4 = 10 10 + 4= 26 26 + 4 = 30 30 + 4= 46 46 + 4 = 50 Similarly, 50 + 4= 66

Directions: Complete the series.

0, 2, 5, 10, 17, 28, ?

  1. 41

  2. 30

  3. 31

  4. 33

  5. 39


Correct Option: A
Explanation:

From the series, it is clear that every term is added to a consecutive prime number to get the next term.

0 + 2 (prime number) = 2 2 + 3 (prime number) = 5 5 + 5 (prime number) = 10 10 + 7 (prime number) = 17 17 + 11 (prime number) = 28 Similarly, 28 + 13 = 41

Directions: Complete the series.

3, 3, 9, 45, 315, ?

  1. 2835

  2. 315

  3. 945

  4. 321

  5. 351


Correct Option: A
Explanation:

From the series, it is clear that every single term in the series is multiplied by an odd number to get the next term.
3*1 = 3    3*3 = 9   9*5 = 45   45*7 = 315   Similarly, 315*9 = 2835

- Hide questions