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Series Completion (RRB)

Description: RRB Reasoning Test, Series Completion (RRB), Missing number, Insert the missing number
Number of Questions: 15
Created by:
Tags: RRB Reasoning Test Series Completion (RRB) Missing number Insert the missing number Number Series
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Directions: Complete the series.

1, 4, 10, 19, 31, 46, ?

  1. 49

  2. 52

  3. 55

  4. 58

  5. 64

Show answer
Correct Option: E
Explanation:

From the given series, it is clear that every next term in the series is obtained by adding the term to each successive multiple of 3.
 
1 + 3 = 4
4 + 6 = 10 10 + 9 = 19 19 + 12 = 31 31 + 15 = 46 Similarly, 46 + 18 = 64

Directions: Complete the series.

9, 10, 5, 6, 3, 4, 2, ?

  1. 1

  2. -3

  3. -1

  4. 0

  5. 3

Show answer
Correct Option: E
Explanation:

From the given series, it is clear that the terms of the series are either incremented by 1 or divided by 2 in the following manner:

9 + 1 = 10 

10/2 = 5 5 + 1 = 6 6/2 = 3 3 + 1 = 4 4/2 = 2 Similarly, 2 + 1 = 3

Directions: Complete the series.

1, 3, 3, 6, 5, 9, 7, 12, ?

  1. 17

  2. 14

  3. 9

  4. 15

  5. 11

Show answer
Correct Option: C
Explanation:

The series is divided into two sub-series of odd places and even places like 1, 3, 5, 7. Digits on odd places are incremented by 2 successively to get the next digit at odd place. Numbers on even places (3, 6, 9, 12) are incremented by 3 successively to get the next number at even place. Similarly, we have to find the numbers at odd place which are incremented by 2.

So, 7 + 2 = 9

Directions: Complete the series.

2, 5, 20, 107, 758, ?

  1. 1409

  2. 845

  3. 773

  4. 6833

  5. 6832

Show answer
Correct Option: D
Explanation:

It is clear from the given series that every term is following the pattern * 1 + 3, * 3 + 5, * 5 + 7 ..... to get the next term.

2 * 1 + 3 = 5 5 * 3 + 5 = 20 20 * 5 + 7 = 107 107 * 7 + 9 = 758 Similarly, 758 * 9 + 11 = 6833

Directions: Complete the series.

5, 7, 11, 19, 35, ?

  1. 51

  2. 43

  3. 67

  4. 70

  5. 39

Show answer
Correct Option: C
Explanation:

In the given series, every term is following the pattern * 2 - 3 to get the next term.

5 * 2 - 3 = 7

7 * 2 - 3 = 11 11 * 2 - 3 = 19   19 * 2 - 3 = 35 Similarly, 35 * 2 - 3 = 67

Directions: Complete the series.

5, 12, 26, 54, 110, ?

  1. 222

  2. 117

  3. 124

  4. 138

  5. 221

Show answer
Correct Option: A
Explanation:

It is clear from the given series that every term is following the pattern + 1 * 2 (1 is added first and then, the result is multiplied by 2) to get the next term.

(5 + 1) * 2 = 12 (12 + 1) * 2 = 26 (26 + 1) * 2 = 54 (54 + 1) * 2 = 110 Similarly, 110 + 1 * 2 = 222

Directions: Complete the series.

50, 45, 41, 38, 36, 35, ?

  1. 35

  2. 30

  3. 31

  4. 33

  5. 34

Show answer
Correct Option: A
Explanation:

Correct. As it is clear from the given series, the terms are subtracted by 5, 4, 3, 2, 1 ... to get the next term.

50 - 5 = 45 45 - 4 = 41 41 - 3 = 38 38 - 2 = 36 36 - 1 = 35 Similarly, 35 - 0 = 35

Directions: Complete the series.

90, 90, 45, 15, 15/4, 3/4, ?

  1. 1/8

  2. 3/4

  3. 3/8

  4. 3/16

  5. 1/4

Show answer
Correct Option: A
Explanation:

It is clear from the series that every term is divided by consecutive natural number to get the next term.

90/1 = 90

90/2 = 45  

45/3 = 15 15/4 = 15/4 (15/4)/5 = 3/4 Similarly, (3/4)/6 = 1/8

Directions: Complete the series.

1, 7, 12, 16, 19, 21, ?

  1. 23

  2. 24

  3. 25

  4. 26

  5. 22

Show answer
Correct Option: E
Explanation:

Correct. As it is clear from the series, every term in the series is added to 6, 5, 4, 3, 2 ..... to get the next term in the following way:

1 + 6 = 7

7 + 5 = 12 12 + 4 = 16 16 + 3 = 19 19 + 2 = 21 Similarly, 21 + 1 = 22

Directions: Complete the following series.

2, 5, 17, 71, 359, ?

  1. 2159

  2. 362

  3. 2154

  4. 371

  5. 2160

Show answer
Correct Option: A
Explanation:

It is clear from the given series that every term is following the pattern * 2 + 1, * 3 + 2, * 4 + 3 .... to get the next term.

2 * 2 + 1 = 5 5 * 3 + 2 = 17 17 * 4 + 3 = 71 71 * 5 + 4 = 359

Similarly, 359 * 6 + 5 = 2159

Directions: Complete the series.

5, 15, 35, 65, 105, 155, ?

  1. 215

  2. 165

  3. 175

  4. 185

  5. 195

Show answer
Correct Option: A
Explanation:

As is clear from the given series, every term is added successively to 10, 20, 30, 40, 50 ... to get the next term.

5 + 10 = 15     15 + 20 = 35     35 + 30 = 65     65 + 40 = 105    105 + 50 = 155  

Similarly, 155 + 60 = 215

Directions: Complete the series.

1, 4, 9, 16, 25, ?

  1. 36

  2. 28

  3. 30

  4. 32

  5. 34

Show answer
Correct Option: A
Explanation:

As it is clear from the series, every term is added to some sets of natural numbers to get the next term.

1 + (1 + 2) = 4

4 + (2 + 3) = 9 9 + (3 + 4) = 16 16 + (4 + 5) = 25 Similarly, 25 + (5 + 6) = 36

Directions: Complete the series.

1, 2, 6, 15, 31, 56, ?

  1. 92

  2. 57

  3. 60

  4. 65

  5. 72

Show answer
Correct Option: A
Explanation:

As it is clear from the series, every term is incremented by the squares of consecutive natural numbers.

1 + 12 = 2 2 + 22 = 6 6 + 32 = 15 15 + 42 = 31

31 + 52 = 56 Similarly, 56 + 62 = 92

Directions: Complete the series.

1, 101, 151, 176, 188.5, ?

  1. 194.75

  2. 288.5

  3. 238.5

  4. 213.5

  5. 201

Show answer
Correct Option: A
Explanation:

As it is clear from the given series, every term is added to natural numbers 100, 50, 25, 12.5 ... in the following way:

1 + 100 = 101  101 + 50 = 151 151 + 25 = 176 176 + 12.5 = 188.5 Similarly, 188.5 + 6.25 = 194.75

Directions: Complete the series.

1, 10, 36, 129, 540, ?

  1. 2725

  2. 549

  3. 566

  4. 5400

  5. 2720

Show answer
Correct Option: A
Explanation:

As it is clear from the given series, every term is first added to a natural number and then, the result is multiplied as follows:

(1 + 9) * 1 = 10  (10 + 8) * 2 = 36 (36 + 7) * 3 = 129 (129 + 6) * 4 = 540 Similarly, (540 + 5) * 5 = 2725

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