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Number Series

Description: Number Series
Number of Questions: 25
Created by:
Tags: number series Series and Classification Number Series
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Directions: Fill the blank with correct alternative

20, 19, 17, (…..), 10, 5

  1. 12

  2. 13

  3. 14

  4. 15

Show answer
Correct Option: C
Explanation:

The pattern is -1, -2,….. So, missing number = 17-3 = 14

Directions: Fill the blank with correct alternative.

1, 4, 9, 16, 25, (…..)

  1. 35

  2. 36

  3. 48

  4. 49

Show answer
Correct Option: B
Explanation:

The numbers are 12, 22, 32, 42, 52 So, missing number = 62 = 36

Directions: Fill the blank with correct alternative

1, 6, 13, 22, 33, (…..)

  1. 44

  2. 45

  3. 46

  4. 47

Show answer
Correct Option: C
Explanation:

The pattern is +5, +7, +9, +11, …. So, missing number = 33+13 = 46

Directions: Fill the blank with correct alternative

3, 9, 27, 81, (…..)

  1. 324

  2. 243

  3. 210

  4. 162

Show answer
Correct Option: B
Explanation:

Each term of the given series is obtained by multiplying its preceding term by 3. So, missing number = 81 * 3 = 243.

Directions: Fill the blank with correct alternative

1, 6, 15, (…...), 45, 66, 91

  1. 25

  2. 26

  3. 27

  4. 28

Show answer
Correct Option: D
Explanation:

The pattern is +5, +9, ….,+21, +25 So, missing number = 15 + 13 = 28

Directions: Fill the blank with correct alternative

0.5, 1.5, 4.5, 13.5, (…..)

  1. 45.5

  2. 39.5

  3. 30.5

  4. 40.5

Show answer
Correct Option: D
Explanation:

Each term of the series is obtained by multiplying the preceding term by 3. So, missing number = 13.5 * 3 = 40.5.

Directions: Fill the blank with correct alternative.

121, 225, 361, (…..)

  1. 441

  2. 484

  3. 529

  4. 729

Show answer
Correct Option: C
Explanation:

The numbers are 112, 152, 192, …., i.e. 112, (11 + 4 x 1)2, (11 + 4 x 2)2 ,…. So, missing number = (11 + 4 x 3)2 = (23)2 = 529.

Directions: Fill the blank with correct alternative

2, 5, 9, (……), 20, 27

  1. 14

  2. 16

  3. 18

  4. 24

Show answer
Correct Option: A
Explanation:

The pattern is +3, +4, ….. So, missing number = 9 + 5 = 14

Directions: Fill the blank with correct alternative

3, 6, 18, 72, (…..)

  1. 144

  2. 216

  3. 288

  4. 360

Show answer
Correct Option: D
Explanation:

The pattern is *2, *3, *4, ….. So, missing number = 72*5 = 360.

Directions: Fill the blank with correct alternative

66, 36, 18, (…..)

  1. 3

  2. 6

  3. 8

  4. 9

Show answer
Correct Option: C
Explanation:

Each number in the series is the product of the digits of the preceding number.

Thus, 6*6 = 36, 3*6 = 18 and so on. So, missing number = 1*8 = 8

Directions: Fill the blank with correct alternative

4, 5, 9, 18, 34, (…..)

  1. 43

  2. 49

  3. 50

  4. 59

Show answer
Correct Option: D
Explanation:

The pattern is +1, +4, +9, +16,…. i.e. +12, +22, +32, +42,…. So, missing number = 34 + 52 = 34 + 25 = 59

Directions: Fill the blank with correct alternative

1, 3, 4, 8, 15, 27, (…..)

  1. 37

  2. 44

  3. 50

  4. 55

Show answer
Correct Option: C
Explanation:

The sum of any three consecutive terms of the series gives the next term.

Thus, 1 + 3 + 4 = 8; 3 + 4 + 8 = 15; 4 + 8 + 15 = 27 and so on. So, missing number = 8 + 15 + 27 = 50.

Directions: Complete the following series:

19, 2, 38, 3, 114, 4, ___

  1. 228

  2. 256

  3. 352

  4. 456

Show answer
Correct Option: D
Explanation:

The sequence is a combination of two series: I.   19, 38, 114, ____ II.   2, 3, 4 The pattern followed in I is *2, *3,…. So, the missing number = 114*4 = 456

Directions: Fill the blank with correct alternative

2, 3, 8, 63, (…..)

  1. 1038

  2. 1998

  3. 3008

  4. 3968

Show answer
Correct Option: D
Explanation:

Each term of the series is one less than the square of the preceding term.

Thus, 22-1 = 3, 32-1 = 8, 82-1 = 63. So, missing number = (63)2 - 1 = 3969-1 = 3968.

Directions: Fill the blank with correct alternative

4, 10, (…..), 82, 244, 730

  1. 24

  2. 28

  3. 77

  4. 218

Show answer
Correct Option: B
Explanation:

Each number in the series is the preceding number multiplied by 3 and then decreased by 2.

Directions: Fill the blank with correct alternative

165, 195, 255, 285, 345, (…..)

  1. 375

  2. 420

  3. 435

  4. 390

Show answer
Correct Option: C
Explanation:

Each number is 15 multiplied by a prime number i.e. 15*11, 15*13, 15*17, 15*19, 15*23. So, missing number = 15*29 = 435.

Directions: Fill the blank with correct alternative

2, 15, 41, 80, (…..)

  1. 111

  2. 120

  3. 121

  4. 132

Show answer
Correct Option: D
Explanation:

The pattern is +13, +26, +39,….. So, missing number = 80 + 52 = 132.

Directions: Fill the blank with correct alternative

24, 60, 120, 210, (…..)

  1. 300

  2. 336

  3. 420

  4. 525

Show answer
Correct Option: B
Explanation:

The pattern is +36, +60, +90,…. i.e.

+[6*(6+0)], +[6*(6+4)], +[6*(6+9)],…. So, Missing number = 210+[6*(6+15)] = 210+126 = 336.

Directions: Fill the blank with correct alternative

9, 11, 20, 31, (…..), 82

  1. 41

  2. 51

  3. 60

  4. 71

Show answer
Correct Option: B
Explanation:

Each term in the series is the sum of the preceding two terms. So, missing number = 20+31 = 51.

Directions: Fill the blank with correct alternative

462, 420, 380, (…..), 306

  1. 322

  2. 332

  3. 342

  4. 352

Show answer
Correct Option: C
Explanation:

The pattern is -42, -40, …. So, missing number = 380-38 = 342.

Directions: Fill the blank with correct alternative

3, 8, 22, 63, 185, (…..)

  1. 550

  2. 310

  3. 295

  4. 285

Show answer
Correct Option: A
Explanation:

The pattern is *3-1, *3-2, *3-3, *3-4,….. So, missing number = (185*3)-5 = 550

Directions: Fill the blank with correct alternative

1, 2, 5, 12, 27, 58, 121, (…..)

  1. 246

  2. 247

  3. 248

  4. 249

Show answer
Correct Option: C
Explanation:

The pattern is *2+0, *2+1, *2+2, *2+3, *2+4, *2+5,….. So, missing number = 121*2+6 = 248

Directions: Fill the blank with correct alternative

97, 86, 73, 58, 45, (…..)

  1. 34

  2. 54

  3. 55

  4. 56

Show answer
Correct Option: A
Explanation:

The pattern is -11, -13, -15, -13, …… So, missing number = 45 - 11 = 34

Directions: Fill the blank with the correct alternative.

3, 12, 27, 48, 75, 108, ( ___ )

  1. 147

  2. 162

  3. 183

  4. 192

Show answer
Correct Option: A
Explanation:

The numbers are 3*12, 3*22, 3*32, 3*42, 3*52, 3*62, …. So, the missing number = 3*72 = 3*49 = 147.

Directions: Fill the blank with correct alternative

17, 19, 23, 29, (…..), 37

  1. 31

  2. 33

  3. 35

  4. 36

Show answer
Correct Option: A
Explanation:

The given series consists of consecutive prime numbers starting from 17. The next prime number after 29 is 31. So, missing number is 31.

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