# 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 ?

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 = 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 ?

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 = 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 ?

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 = 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 ?

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

2 4 12 60 420 ?

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 = 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 ?

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 = 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

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

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, ?

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

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

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

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 ?

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

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 ?

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
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 ?

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 ?

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

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 ?

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 ?

Correct Ans:83
Explanation:
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
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16. Find out the wrong number in the following number series.

6, 14, 42, 135, 517, 2377.5

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

21, 42, 70, 115, 147, 196

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

723, 505, 335, 207, ?

Correct Ans:115
Explanation:
The series is,
93 - 6 = 723
83 - 7 = 505
73 - 8 = 335
63 - 9 = 207
53 - 10 = 115
115 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, ?

Correct Ans:172
Explanation:
The series is,
132 + (12 - 1) = 132
132 + (22 - 2) = 134
134 + (32 - 3) = 140
140 + (42 - 4) = 152
152 + (52 - 5) = 172
172 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, ?

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.
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