# Number Series Questions and Answers updated daily – Aptitude

Number Series Questions: Solved 1295 Number Series Questions and answers section with explanation for various online exam preparation, various interviews, Aptitude Category online test. Category Questions section with detailed description, explanation will help you to master the topic.

## Number Series Questions

1. Directions : What will come in place of question mark (?) in the following series?

767 495 359 291 257 ?

767 495 359 291 257 ?

SHOW ANSWER

Correct Ans:240

Explanation:

767 495 359 291 257 ?

Series Pattern Given Series

767 767

767 â€“ 272 = 495

495 â€“ 136 = 359

359 â€“ 68 = 291

291 â€“ 34 = 257

257 â€“ 17 =

Hence, option (B) is correct.

Series Pattern Given Series

767 767

767 â€“ 272 = 495

495 â€“ 136 = 359

359 â€“ 68 = 291

291 â€“ 34 = 257

257 â€“ 17 =

**240**Hence, option (B) is correct.

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2. Directions : What will come in place of question mark (?) in the following series?

50 67 33 84 16 ?

50 67 33 84 16 ?

SHOW ANSWER

Correct Ans:101

Explanation:

50 67 33 84 16 ?

Series Pattern Given Series

50 = 50

50 + 17 = 67

67 â€“ 34 = 33

33 + 51 = 84

84 â€“ 68 = 16

16 + 85 =

Hence, option (A) is correct.

Series Pattern Given Series

50 = 50

50 + 17 = 67

67 â€“ 34 = 33

33 + 51 = 84

84 â€“ 68 = 16

16 + 85 =

**101**Hence, option (A) is correct.

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3. Directions : What will come in place of question mark (?) in the following series?

7 13 25 49 97 ?

7 13 25 49 97 ?

SHOW ANSWER

Correct Ans:193

Explanation:

7 13 25 49 97 ?

Series Pattern Given Series

7 = 7

7 * 2 â€“ 1 = 13

13 * 2 â€“ 1 = 25

25 * 2 â€“ 1 = 49

49 * 2 â€“ 1 = 97

97 * 2 â€“ 1 =

Hence, option (D) is correct.

Series Pattern Given Series

7 = 7

7 * 2 â€“ 1 = 13

13 * 2 â€“ 1 = 25

25 * 2 â€“ 1 = 49

49 * 2 â€“ 1 = 97

97 * 2 â€“ 1 =

**193**Hence, option (D) is correct.

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4. Directions : What will come in place of question mark (?) in the following series?

9 13 22 36 55 ?

9 13 22 36 55 ?

SHOW ANSWER

Correct Ans:79

Explanation:

9 13 22 36 55 ?

Series I : 9 13 22 36 55 79

Series II : + 4 + 9 + 14 + 19 + 24

Series III : + 5 + 5 + 5 + 5

Hence, option (A) is correct.

Series I : 9 13 22 36 55 79

Series II : + 4 + 9 + 14 + 19 + 24

Series III : + 5 + 5 + 5 + 5

Hence, option (A) is correct.

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5. Directions : What will come in place of question mark (?) in the following series?

2 4 12 60 420 ?

2 4 12 60 420 ?

SHOW ANSWER

Correct Ans:4620

Explanation:

2 4 12 60 420 ?

Series Pattern Given Series

2 = 2

2 * 2 = 4

4 * 3 = 12

12 * 5 = 60

60 * 7 = 420

420 * 11 =

Hence, option (B) is correct.

Series Pattern Given Series

2 = 2

2 * 2 = 4

4 * 3 = 12

12 * 5 = 60

60 * 7 = 420

420 * 11 =

**4620**Hence, option (B) is correct.

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6. Directions : What will come in place of question mark (?) in the following series?

13 15 21 33 53 ?

13 15 21 33 53 ?

SHOW ANSWER

Correct Ans:83

Explanation:

13 15 21 33 53 ?

Series Pattern Given Series

13 = 13

13 + 12 + 1 = 15

15 + 22 + 2 = 21

21 + 32 + 3 = 33

33 + 42 + 4 = 53

53 + 52 + 5 =

Hence, option (C) is correct.

Series Pattern Given Series

13 = 13

13 + 12 + 1 = 15

15 + 22 + 2 = 21

21 + 32 + 3 = 33

33 + 42 + 4 = 53

53 + 52 + 5 =

**83**Hence, option (C) is correct.

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7. Direction: What will come in place of the question mark (?) in the following number series?

177, 170, 159, 146, ? ,110

177, 170, 159, 146, ? ,110

SHOW ANSWER

Correct Ans:129

Explanation:

177, 170, 159, 146, ? ,110

Let find the solution:

The numbers given here have difference of prime numbers in accending order starting from 7.

177 â€“ 170 = 7

170 â€“ 159 = 11

159 â€“ 146 = 13

Hence next number become

129 â€“ 110 = 19

Let find the solution:

The numbers given here have difference of prime numbers in accending order starting from 7.

177 â€“ 170 = 7

170 â€“ 159 = 11

159 â€“ 146 = 13

Hence next number become

**146 â€“ 17 = 129**129 â€“ 110 = 19

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8. Direction: What should come in place of question mark (?) in the following number series?

2, 17, 45, 99, 205, ?

2, 17, 45, 99, 205, ?

SHOW ANSWER

Correct Ans:415

Explanation:

2, 17, 45, 99, 205, ?

Let find the solution:

2 * 2 + 13 = 17

17 * 2 + 11 = 45

45 * 2 + 9 = 99

99 * 2 + 7 = 205

Let find the solution:

2 * 2 + 13 = 17

17 * 2 + 11 = 45

45 * 2 + 9 = 99

99 * 2 + 7 = 205

**205 * 2 + 5 = 415**
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9. Direction: What will come in place of question mark (?) in the following number series?

243 ,? ,252, 279, 343, 468

243 ,? ,252, 279, 343, 468

SHOW ANSWER

Correct Ans:244

Explanation:

243 ,? ,252, 279, 343, 468

Let be starts from the end of series.

468 â€“ 343 = 125 = 53

343 â€“ 279 = 64 = 43

279 â€“ 252 = 27 = 33

252 â€“ 244 = 8 = 23

244 â€“ 243 = 1 = 13

Thus, 243 244 252 279 343 468

Let be starts from the end of series.

468 â€“ 343 = 125 = 53

343 â€“ 279 = 64 = 43

279 â€“ 252 = 27 = 33

252 â€“ 244 = 8 = 23

244 â€“ 243 = 1 = 13

Thus, 243 244 252 279 343 468

**Hence, option B is correct.**
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10. Directions : What will come in place of question mark (?) in the following series?

432 443 463 500 562 ?

432 443 463 500 562 ?

SHOW ANSWER

Correct Ans:657

Explanation:

Series Pattern Given Series

432 432

432 + (12 + 10) = 443

443 + (32 + 11) = 463

463 + (52 + 12) = 500

500 + (72 + 13) = 562

562 + (92 + 14) = 657

432 432

432 + (12 + 10) = 443

443 + (32 + 11) = 463

463 + (52 + 12) = 500

500 + (72 + 13) = 562

562 + (92 + 14) = 657

**Hence, option (B) is correct.**
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11. Directions : What will come in place of question mark (?) in the following series?

320 160 240 600 2100 ?

320 160 240 600 2100 ?

SHOW ANSWER

Correct Ans:9450

Explanation:

Series Pattern Given Series

320 320

320 * (1/2) = 160

160 * (3/2) = 240

240 * (5/2) = 600

600 * (7/2) = 2100

2100 * (9/2) = 9450

320 320

320 * (1/2) = 160

160 * (3/2) = 240

240 * (5/2) = 600

600 * (7/2) = 2100

2100 * (9/2) = 9450

**Hence, option (C) is correct.**
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12. Directions : What will come in place of question mark (?) in the following series?

50 67 33 84 16 ?

50 67 33 84 16 ?

SHOW ANSWER

Correct Ans:101

Explanation:

Series Pattern Given Series

50 50

50 + 17 = 67

67 – 34 = 33

33 + 51 = 84

84 – 68 = 16

16 + 85 = 101

**Hence, option (A) is correct.**

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13. Directions : What will come in place of question mark (?) in the following series?

9 13 22 36 55 ?

9 13 22 36 55 ?

SHOW ANSWER

Correct Ans:79

Explanation:

Series Pattern:

Series I : 9 13 22 36 55 79

Series II : + 4 + 9 + 14 + 19 + 24

Series III : + 5 + 5 + 5 + 5

Series I : 9 13 22 36 55 79

Series II : + 4 + 9 + 14 + 19 + 24

Series III : + 5 + 5 + 5 + 5

**Hence, option (A) is correct.**
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14. Directions : What will come in place of question mark (?) in the following series?

2 4 12 60 420 ?

2 4 12 60 420 ?

SHOW ANSWER

Correct Ans:4620

Explanation:

Series Pattern Given Series

2 = 2

2 × 2 = 4

4 × 3 = 12

12 × 5 = 60

60 × 7 = 420

420 × 11 = 4620

**Hence, option (B) is correct.**

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15. Directions : What will come in place of question mark (?) in the following series?

13 15 21 33 53 ?

13 15 21 33 53 ?

SHOW ANSWER

Correct Ans:83

Explanation:

Series Pattern Given Series

13 = 13

13 + 1

15 + 2

21 + 3

33 + 4

53 + 5

13 = 13

13 + 1

^{2}+ 1 = 1515 + 2

^{2}+ 2 = 2121 + 3

^{2}+ 3 = 3333 + 4

^{2}+ 4 = 5353 + 5

^{2}+ 5 = 83
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16. Find out the wrong number in the following number series.

6, 14, 42, 135, 517, 2377.5

6, 14, 42, 135, 517, 2377.5

SHOW ANSWER

Correct Ans:135

Explanation:

The series is,

(6 * 0.5) + 11 = 14

(14 * 1.5) + 21 = 42

(42 * 2.5) + 31 = 136 (not 135)

(136 * 3.5) + 41 = 517

(517 * 4.5) + 51 = 2377.5

The wrong term is 135

(6 * 0.5) + 11 = 14

(14 * 1.5) + 21 = 42

(42 * 2.5) + 31 = 136 (not 135)

(136 * 3.5) + 41 = 517

(517 * 4.5) + 51 = 2377.5

The wrong term is 135

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17. Find out the wrong number in the following number series.

21, 42, 70, 115, 147, 196

21, 42, 70, 115, 147, 196

SHOW ANSWER

Correct Ans:115

Explanation:

The series is,

21 + (3 * 7) = 42

42 + (4 * 7) = 70

70 + (5 * 7) = 105

105 + (6 * 7) = 147

147 + (7 * 7) = 196

The wrong term is 115

21 + (3 * 7) = 42

42 + (4 * 7) = 70

70 + (5 * 7) = 105

105 + (6 * 7) = 147

147 + (7 * 7) = 196

The wrong term is 115

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

723, 505, 335, 207, ?

723, 505, 335, 207, ?

SHOW ANSWER

Correct Ans:115

Explanation:

The series is,

9

8

7

6

5

115 is the missing number.

9

^{3}- 6 = 7238

^{3}- 7 = 5057

^{3}- 8 = 3356

^{3}- 9 = 2075

^{3}- 10 = 115115 is the missing number.

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

132, 132, 134, 140, 152, ?

132, 132, 134, 140, 152, ?

SHOW ANSWER

Correct Ans:172

Explanation:

The series is,

132 + (1

132 + (2

134 + (3

140 + (4

152 + (5

172 is the missing number.

132 + (1

^{2}- 1) = 132132 + (2

^{2}- 2) = 134134 + (3

^{2}- 3) = 140140 + (4

^{2}- 4) = 152152 + (5

^{2}- 5) = 172172 is the missing number.

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

840, 960, 1120, 1344, ?

840, 960, 1120, 1344, ?

SHOW ANSWER

Correct Ans:1680

Explanation:

The series is,

840 * 8/7 = 960

960 * 7/6 = 1120

1120 * 6/5 = 1344

1344 * 5/4 = 1680

1680 is the missing number.

840 * 8/7 = 960

960 * 7/6 = 1120

1120 * 6/5 = 1344

1344 * 5/4 = 1680

1680 is the missing number.

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