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Series Completion

Description: A test of number series for UGC NET, BANK PO, MBA aspirants....All the best!!
Number of Questions: 25
Created by:
Tags: Series Completion Series Arithmetic Reasoning
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Directions: Choose the correct number from the given options and fill in the next number in the series given below.

2, 3, 5, 8, 12, 17, ___

  1. 23

  2. 22

  3. 35

  4. 34

Show answer
Correct Option: A
Explanation:

The difference of two successive terms is 1, 2, 3, 4, 5 and so on. 

Directions: Complete the given series.

2, 7, 12, 17, 22, 27, ___

  1. 29

  2. 23

  3. 32

  4. 44

Show answer
Correct Option: C
Explanation:

The difference between two successive terms is constant, i.e. 5. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

5, 8, 14, 26, 50, __

  1. 75

  2. 99

  3. 98

  4. 101

Show answer
Correct Option: C
Explanation:

The difference between two successive terms are 3, 6,12, 24, 48, etc.

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

7, 11, 13, 17, 19, 23 __

  1. 29

  2. 27

  3. 33

  4. 36

Show answer
Correct Option: A
Explanation:

This is a prime number series and the prime number next to 23 is 29. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

5, 9, 21, 37, 81, __

  1. 101

  2. 153

  3. 162

  4. 121

Show answer
Correct Option: B
Explanation:

Each term is doubled and operate -1,+ 3, - 5, + 7, - 9, and so on.

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

8, 27, 125, 343, __

  1. 1331

  2. 686

  3. 250

  4. 3113

Show answer
Correct Option: A
Explanation:

These numbers are cubes of 2, 3, 5, 7, 11 which are prime numbers and the cube of 11 is 1331. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

3, 6, 18, 72, 360, __

  1. 2160

  2. 1260

  3. 720

  4. 144

Show answer
Correct Option: A
Explanation:

The terms are being multiplied by 2, 3, 4, 5, 6, etc. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

31, 37, 41, 43, 47, __

  1. 89

  2. 71

  3. 53

  4. 54

Show answer
Correct Option: C
Explanation:

This is a prime number series. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

99, 63, 35, 15, ___

  1. 7

  2. 3

  3. 5

  4. 1

Show answer
Correct Option: B
Explanation:

The numbers are written as 102 - 1, 82 - 1, 62 - 1, 42 - 1, 2² - 1, and so on. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

3, 35, 99, 195, ___

  1. 323

  2. 317

  3. 387

  4. 377

Show answer
Correct Option: A
Explanation:

The numbers are written as 2² -1, 6²-1, 10²-1, 14²-1, 18²-1, etc.

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

23, 47, 97, 199, 405, __

  1. 132

  2. 121

  3. 819

  4. 129

Show answer
Correct Option: C
Explanation:

Each number is doubled and then 1, 3, 5, 7, 9 are added to the result. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

7, 15, 31, 63, 127, __

  1. 254

  2. 255

  3. 257

  4. 261

Show answer
Correct Option: B
Explanation:

Each number is doubled and add 1 to the result. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

5, 11, 21, 43, 85, ____

  1. 170

  2. 121

  3. 271

  4. 171

Show answer
Correct Option: D
Explanation:

The numbers are doubled and then one is added and subtracted, alternatively. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

17, 21, 29, 45, 77, __

  1. 140

  2. 141

  3. 142

  4. 143

Show answer
Correct Option: B
Explanation:

The differences are 4, 8, 16, 32, 64 and so on. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

15, 31, 66, 141, 298, __

  1. 597

  2. 599

  3. 611

  4. 621

Show answer
Correct Option: D
Explanation:

The differences are 1², 2², 3², 4², 5², 6² and so on.

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

11, 13, 17, 19, 23, 29, __

  1. 31

  2. 32

  3. 33

  4. 34

Show answer
Correct Option: A
Explanation:

A Prime number series. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

11, 19, 35, 59, 91, __

  1. 121

  2. 155

  3. 131

  4. 151

Show answer
Correct Option: C
Explanation:

The differences are 8, 16, 24, 32, 40, etc. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

5, 12, 22, 46, 90, __

  1. 172

  2. 176

  3. 178

  4. 182

Show answer
Correct Option: D
Explanation:

Double the number and add 2 and subtract 2 alternatively. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

1, 4, 27, 16, 125, 36, __

  1. 243

  2. 343

  3. 529

  4. 216

Show answer
Correct Option: B
Explanation:

The numbers are 1³, 2², 3³, 4², 5³, 6² and so on.

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

17, 71, 28, 82, 39, __

  1. 83

  2. 93

  3. 73

  4. 57

Show answer
Correct Option: B
Explanation:

In the series, each number is formed by reversing the digits of preceding number. So, the required answer is 93.

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

17, 23, 31, 41, 47, __

  1. 59

  2. 53

  3. 42

  4. 50

Show answer
Correct Option: A
Explanation:

The given series is an alternate prime number series. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

111, 129, 183, 345, 831, __

  1. 2389

  2. 2379

  3. 2289

  4. 1662

Show answer
Correct Option: C
Explanation:

The differences are 18, 54, 162, 486, 1458. These are three times the previous term. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

5, 26, 126, 626, __

  1. 3124

  2. 2126

  3. 3125

  4. 3126

Show answer
Correct Option: D
Explanation:

Each number is multiplied by 5 and then 1 is added to the result. 

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

4, 27, 16, 125, 36, __

  1. 243

  2. 343

  3. 368

  4. 216

Show answer
Correct Option: B
Explanation:

2², 3³, 4², 5³, 6², 7³ and so on.

Directions: Choose the correct number from the given options and fill in the next number in the series given below.

6, 19, 56, 169, 506, __

  1. 1519

  2. 1518

  3. 1517

  4. 1609

Show answer
Correct Option: A
Explanation:

Multiply the number by 3 and subtract one from the result. 

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