# 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

41. Find the wrong term in the following number series.
2, 7, 27, 107, 427, 1708, 6827

Correct Ans:1708
Explanation:
The pattern is
2 x 4 - 1 = 7
7 x 4 - 1 = 27
27 x 4 - 1 = 107
107 x 4 - 1 = 427
427 x 4 - 1 = 1707
1707 x 4 - 1 = 6827
So, the wrong term is 1708.
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42. Find the wrong term in the following number series.
168, 288, 360, 528, 841, 960

Correct Ans:841
Explanation:
The pattern is
132 - 1 = 168
172 - 1 = 288
192 - 1 = 360
232 - 1 = 528
292 - 1 = 840
312 - 1 = 960
So, the wrong term is 841.
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43. Complete the number series.
9, 11, 15, ?, 39, 71

Correct Ans:23
Explanation:
The pattern is
9 + 2 = 11
11 + 22 = 15
15 + 23 = 23
23 + 24 = 39
39 + 25 = 71.
Hence, the correct answer is 23.
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44. Complete the number series.
8, 24, 12, 36, 18, 54, ?

Correct Ans:27
Explanation:
The pattern is
8 x 3 = 24
24 Ã· 2 = 12
12 x 3 = 36
36 Ã· 2 = 18
18 x 3 = 54
54 Ã· 2 = 27.
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45. Complete the number series.
11(1/9), 12(1/2), 14(2/7), 16(2/3), ?

Correct Ans:20
Explanation:
The pattern is
11(1/9) = (100/9) x (1/100) = 1/9
12(1/2) = (25/2) x (1/100) = 1/8
14(2/7) = (100/7) x (1/100) = 1/7
16(2/3) = (50/3) x (1/100) = 1/6
20/100 = 1/5
Hence, 20 is the correct answer.
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46. In the following series, one number is wrong. Find out the wrong term.

82, 107, 207, 434, 832, 1457

Correct Ans:434
Explanation:
The correct pattern followed in the given number series is:
82 + (25 * 12) = 82 + (25 * 1) = 82 + 25 = 107
107 + (25 * 22) = 107 + (25 * 4) = 107 + 100 = 207
207 + (25 * 32) = 207 + (25 * 9) = 207 + 225 = 432 (Which is wrongly given as 434)
432 + (25 * 42) = 432 + (25 * 16) = 432 + 400 = 832
832 + (25 * 52) = 832 + (25 * 25) = 832 + 625= 1457
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47. In the following series, one number is wrong. Find out the wrong term.

7, 10, 12, 14, 17, 19, 22, 22

Correct Ans:19
Explanation:
The pattern is,
First series
7 + 5 = 12
12 + 5 = 17
17 + 5 = 22
Second series
10 + 4 = 14
14 + 4 = 18
18 + 4 = 22
So, wrong term is 19
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48. Find the missing number.

512, 345, 227, 182, ?, 159

Correct Ans:162
Explanation:
The pattern is,
512 - (132 - 2) = 512 - 167 = 345
345 - (112 - 3) = 345 - 118 = 227
227 - (72 - 4) = 227 - 45 = 182
182 - (52 - 5) = 182 - 20 = 162
162 - (32 - 6) = 162 - 3 = 159
162 is the missing number.
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49. Find the missing number.

980, 516, 284, 168, 110, ?

Correct Ans:81
Explanation:
The pattern is,
980/2 + 26 = 490 + 26 = 516
516/2 + 26 = 258 + 26 = 284
284/2 + 26 = 142 + 26 = 168
168/2 + 26 = 84 + 26 = 110
110/2 + 26 = 55 + 26 = 81
81 is the missing number.
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50. Find the missing number.

9, 62, ?, 1854, 7415, 22244

Correct Ans:371
Explanation:
The pattern is,
9*7 - 1 = 63 - 1 = 62
62*6 - 1 = 372 - 1 = 371
371*5 - 1 = 1855 - 1 = 1854
1854*4 - 1 = 7416 - 1 = 7415
7415*3 - 1 = 22245 - 1 = 22244
371 is the missing series.
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51. Find the missing number.

1680, 210, 30, 5, ?, 0.25

Correct Ans:1
Explanation:
The pattern is,
1680 Ã· 8 = 210
210 Ã· 7 = 30
30 Ã· 6 = 5
5 Ã· 5 = 1
1 Ã· 4 = 0.25
1 is the missing number.
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52. Find the missing number.

30, 62 , 189, ?, 3805, 22836

Correct Ans:760
Explanation:
The pattern is,
30*2 + 2 = 62
62*3 + 3 = 189
189*4 + 4 = 760
760*5 + 5 = 3805
3805*6 + 6 = 22836
760 is the missing number.
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53. Find the missing number.

1, 2, 12, 63, 316, ?

Correct Ans:1705
Explanation:
The pattern is,
1*1 + 1<.sup>3 = 1 + 1 = 2
2*2 + 2<.sup>3 = 4 + 8 = 12
12*3 + 3<.sup>3 = 36 + 27 = 63
63*4 + 4<.sup>3 = 252 + 64 = 316
316*5 + 5<.sup>3 = 1580 + 125 = 1705
1705 is the missing number.
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54. Find the missing number.

1327, 992, 713, 480, 279, ?

Correct Ans:88
Explanation:
The pattern is,
113 - 4 = 1327
103 - 8 = 992
93 - 16 = 713
83 - 32 = 480
73 - 64 = 279
63 - 128 = 88
88 is the missing number.
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55. Find the missing number.

5, 8, 28, 162, ?, 12870

Correct Ans:1288
Explanation:
The pattern is,
5*2 - 2 = 8
8*4 - 4 = 28
28*6 - 6 = 162
162*8 - 8 = 1288
1288*10 - 10 = 12870
1288 is the missing number.
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56. In the following series, one number is wrong. Find out the wrong term.

50, 90, 150, 245, 375, 577.5

Correct Ans:245
Explanation:
The pattern is,
50 + 40 = 90
90 + (40 * 1.5) = 90 + 60 = 150
150 + (60 * 1.5) = 150 + 90 = 240 (which is wrongly given as 245)
240 + (90 * 1.5) = 240 + 135 = 375
375 + (135* 1.5) = 375 + 202.5 = 577.5

Thus, the correct pattern is:
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57. In the following series, one number is wrong. Find out the wrong term.

3 , 3 , 10 , 36 , 100 , 223

Correct Ans:100
Explanation:
The pattern is,
3 + 13 - 1 = 3
3 + 23 - 1 = 10
10 + 33 - 1 = 36
36 + 43 - 1 = 99
99 + 53 - 1 = 223
100 is the wrong number.
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58. Find the missing number.

10, 14.5, 23.5, 41.5, 77.5, ?

Correct Ans:149.5
Explanation:
The pattern is,
10*2 - 5.5 = 20 - 5.5 = 14.5
14.5*2 - 5.5 = 29 - 5.5 = 23.5
23.5*2 - 5.5 = 47 - 5.5 = 41.5
41.5*2 - 5.5 = 83 - 5.5 = 77.5
77.5*2 - 5.5 = 155 - 5.5 = 149.5
149.5 is the missing number.
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59. Find the missing number.

4, 9, 16, 35, 66, 137, ?

Correct Ans:268
Explanation:
The pattern is,
4*2 + 1 = 9
9*2 - 2 = 16
16*2 + 3 = 35
35*2 - 4 = 66
66*2 + 5 = 137
137*2 - 6 = 268
268 is the missing series.
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60. Find the missing number.

24, 70, 144, 252, ?, 594

Correct Ans:400
Explanation:
The pattern is,
52*1 - 1 = 25 - 1 = 24
62*2 - 2 = 72 - 2 = 70
72*3 - 3 = 147 - 3 = 144
82*4 - 4 = 256 - 4 = 252
92*5 - 5 = 405 - 5 = 400
102*6 - 6 = 600 - 6 = 594
400 is the missing number.
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