Series Questions

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21.

In each of the following number series, a wrong number is given. Find out that number.

346, 342, 333, 308, 259, 178

A

178

B

333

C

342

D

259

Correct Answer: A

The series follows the following pattern:

346 - 22 = 342

342- 32 = 333

333 - 52 = 308

308 - 72 = 259

259 - 112 = 138

∴ The wrong term in the series is 178.

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22.

Find the wrong number in the given series:

3, 4, 20, 101, 357, 935, 2278

A

357

B

101

C

20

D

935

Correct Answer: D

The number pattern in the series can be decoded as:

⇒ 3

⇒ 4 – 3 = 1 = 1⁴

⇒ 20 – 4 = 16 = 2⁴

⇒ 101 – 20 = 81 = 3⁴

⇒ 357 – 101 = 256 = 4⁴

⇒ 982 – 357 = 625 = 5⁴

⇒ 2278 – 982 = 1296 = 6⁴

∴ The incorrect number in the series is 935

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23.

Find out the wrong number in the series:

128, 64, 96, 360, 840, 3780

A

840

B

64

C

360

D

96

Correct Answer: C

128 × 0.5 = 64

64 × 1.5 = 96

96 × 2.5 = 240 (360)

240 × 3.5 = 840

840 × 4.5 = 3780 

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24.

Find out the wrong number in the series:

46, 61, 78, 97, 118, 142

A

61

B

78

C

142

D

97

Correct Answer: C

9 × 5 + 1 = 46

10 × 6 + 1 = 61

11 × 7 + 1 = 78

12 × 8 + 1 = 97

13 × 9 + 1 = 118

14 × 10 + 1 = 141 (142)

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25.

Find the wrong number in the given series.

24, 29, 62, 179, 758, 3791

A

62

B

29

C

758

D

3791

Correct Answer: E

24 × 1 + 5 = 29

29 × 2 + 4 = 62

62 × 3 + 3 = 189

189 × 4 + 2 = 758

758 × 5 + 1 = 3791

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26.

Find the wrong number in the given series:

7, 12, 33, 122, 635, 3804

A

33

B

12

C

3804

D

122

Correct Answer: D

7 × 2 – 2 = 12

12 × 3 – 3 = 33

33 × 4 – 4 = 128

128 × 5 – 5 = 635

635 × 6 – 6 = 3804

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27.

What should come in place of the question mark '?' in the following number series?

12, 13, 27, ?, 329, 1646

A

78

B

84

C

82

D

88

Correct Answer: C

The series follows the following pattern:

12 × 1 + 1 = 13

13 × 2 + 1 = 27

27 × 3 + 1 = 82

82 × 4 + 1 = 329

329 × 5 + 1 = 1646

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28.

What should come in place of the question mark '?' in the following number series?

45, 54, 70, 95, 131, ?

A

170

B

180

C

190

D

210

Correct Answer: B

The series follows the following pattern:

45 + 3² = 54

54 + 4² = 70

70 + 5² = 95

95 + 6² = 131

131 + 7² = 180

 

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29.

What should come in place of the question mark '?' in the following number series?

6, 19, 59, 180, 544, ? 

A

1613

B

1597

C

1625

D

1637

Correct Answer: D

The pattern of the series is

6 × 3 + 1 = 19

19 × 3 + 2 = 59

59 × 3 + 3 = 180

180 × 3 + 4 = 544

544 × 3 + 5 = 1637 

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30.

What should come in place of the question mark '?' in the following number series?

52, 63, 50, 65, ?, 67

A

42

B

54

C

52

D

56

Correct Answer: E

The pattern of the series is

52 + 11 = 63

63 – 13 = 50

50 + 15 = 65

65 – 17 = 48

48 + 19 = 67

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