Series Questions

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11.

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

218, 127, ?, 29, 10

A

76

B

86

C

81

D

66

Correct Answer: D

The pattern followed in this question is:

2³ + 2 = 10

3³ + 2 = 29

4³ + 2 = 66

5³ + 2 = 127

6³ + 2 = 218

∴ The missing term is 66 & correct alternative is 4.

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12.

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

3, ?, 9, 15, 23

A

25

B

15

C

20

D

5

Correct Answer: D

The pattern followed in this question is:

0² + 3 = 3

1² + 4 = 5

2² + 5 = 9

3² + 6 = 15

4² + 7 = 23

∴ The missing term is 5 & correct alternative is 4.

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13.

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

25, 200, 40, ?, 64, 512

A

320

B

45

C

80

D

64

Correct Answer: A

Calculation:

The series follows the pattern:

⇒ 25 × 8 = 200

⇒ 200 ÷ 5 = 40

⇒ 40 × 8 = 320

⇒ 320 ÷ 5 = 64

⇒ 64 × 8 = 512

∴ The missing number is 320.

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14.

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

4680, 360, ?, 9, 3

A

45

B

44

C

46

D

43

Correct Answer: A

Fibonacci Series is a special number series in which each term is obtained by adding the previous 2 terms starting from 1, 1.

The Fibonacci Range Used: 3, 5, 8, 13

3 × 3 = 9

9 × 5 = 45

45 × 8 = 360

360 × 13 = 4680

∴ The missing term is 45 & correct alternative is 1.

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15.

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

5.5, 9, 16, 30, 58, ?

A

108

B

86

C

94

D

114

Correct Answer: D

The series follows the following pattern:

5.5 × 2 - 2 = 9

9 × 2 - 2 = 16

16 × 2 - 2 = 30

30 × 2 - 2 = 58

58 × 2 - 2 = 114

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16.

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

12, 23, 45, ?, 177, 353

A

93

B

97

C

101

D

83

Correct Answer: E

The series follows the following pattern:

12 × 2 - 1 = 23

23 × 2 - 1 = 45

45 × 2 - 1 = 89

89 × 2 - 1 = 177

177 × 2 - 1 = 353

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17.

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

295, 286, 268, 241, 205, ?

A

160

B

170

C

180

D

190

Correct Answer: A

Considering the above series-

295, 286, 268, 241, 205, ?

The logic of the series can be explained as,

295 – 9 = 286

286 – 18 = 268

268 – 27 = 241

241 – 36 = 205

By observing the pattern, we can write

205 – 45 = 160

⇒ ? = 160

∴ The value of ? is 160.

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18.

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

234, 238, 252, 276, ?, 354

A

308

B

306

C

310

D

312

Correct Answer: C

The pattern followed by the series is

234 + 4 = 238

238 + 14 = 252

252 + 24 = 276 

276 + 34 = 310 

310 + 44 = 354 

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19.

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

5, 5, 10, 20, 35, 55, ?

A

55

B

80

C

75

D

85

Correct Answer: B

Calculation:

The series follows following pattern:

⇒ 5 + 0 = 5

⇒ 5 + 5 = 10

⇒ 10 + 10 = 20

⇒ 20 + 15 = 35

⇒ 35 + 20 = 55

⇒ 55 + 25 = 80

∴ The missing number is 80

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20.

Find the wrong number in the given series:

10, 6, 5, 9, 16, 41

A

9

B

10

C

6

D

41

Correct Answer: A

10 × 0.5 + 1 = 6

6 × 1 – 1 = 5

5 × 1.5 + 1 = 8.5

8.5 × 2 – 1 = 16

16 × 2.5 + 1 = 41

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