Number Series (Previous Year Questions )test -1

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| By Ashwin

Ashwin

Community Contributor

Quizzes Created: 6 | Total Attempts: 674

Questions: 15 | Attempts: 152 | Updated: Mar 20, 2023

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Questions and Answers

1.

14, 8, 7, 11.5, 22, ?
- A.
  
  54
- B.
  
  64
- C.
  
  62
- D.
  
  58
- E.
  
  56
Correct Answer
E. 56

Explanation
14*0.5 + 1 = 7+1= 8
8*1 - 1 = 8-1 = 7
7*1.5 + 1 = 10.5 + 1 = 11.5
11.5*2 - 1 = 23 - 1 = 22
22*2.5 +1 = 55+1 =56

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2.

8, 14, 25, 46, 82, ?
- A.
  
  132
- B.
  
  130
- C.
  
  138
- D.
  
  128
- E.
  
  142
Correct Answer
C. 138

Explanation
14 - 8 = 6
25 - 14 =11
46 - 25 = 21
82 - 46 = 36

Now take the difference of difference
11 - 6 = 5
21 - 11 = 10
36 - 21 = 15

The next term will be 20. The difference will be 36 + 20 = 56.

The required term is 82 + 56 = 138.

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3.

13, 14, 30, 93, ?, 1885
- A.
  
  358
- B.
  
  336
- C.
  
  364
- D.
  
  376
Correct Answer
D. 376

Explanation
13*1 + 1 = 14
14*2 +2 = 28+2 = 30
30*3 + 3 = 90+3 =93
93*4 + 4 = 372+4 = 376

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4.

65, 70, 63, 74, 61, ?
- A.
  
  78
- B.
  
  52
- C.
  
  72
- D.
  
  58
Correct Answer
A. 78

Explanation
We can note that consecutive prime numbers are either added or subtracted starting from 5.

65+5 = 70
70-7 = 63
63+11 = 74
74-13 = 61
61+17 = 78

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5.

11, 20, 38, 74, ?
- A.
  
  146
- B.
  
  154
- C.
  
  128
- D.
  
  136
Correct Answer
A. 146

Explanation
11*2 - 2 = 22-2 =20
20*2 - 2= 40-2 = 38
38*2 - 2= 76 - 2 = 74
74*2 - 2 = 148-2 = 146

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6.

15, 21, 38, 65, 101, ?
- A.
  
  124
- B.
  
  145
- C.
  
  136
- D.
  
  158
Correct Answer
B. 145

Explanation
21 - 15 = 6
38 - 21 = 17
65 - 38 = 27
101 - 65 = 36
Now, let us take the difference of difference.
17 - 6 = 11
27 - 17 = 10
36 - 27 = 9
Continuing the sequence, we get the next term as 36+8 = 44
101 + 44 = 145.

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7.

24, 28, 19, 35, 10, ?
- A.
  
  26
- B.
  
  36
- C.
  
  16
- D.
  
  46
Correct Answer
D. 46

Explanation
24 + 4 = 28
28 - 9 = 19
19 + 16 = 35
35 - 25 = 10
10 + 36 = 46

The pattern is +4, -9, +16, -25, +36 (Squares with alternate sign)

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8.

7, 16, 45, 184, 915, ?
- A.
  
  2092
- B.
  
  5496
- C.
  
  1048
- D.
  
  4038
Correct Answer
B. 5496

Explanation
7*2 + 2= 14+2 = 16
16*3 - 3 = 48 - 3 = 45
45*4 + 4 = 180+4 = 184
184*5 - 5 = 920 - 5 = 915.
915*6 + 6 = 5490+ 6 = 5496.

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9.

9, 5, 6, 10.5, 23, ?
- A.
  
  85
- B.
  
  60
- C.
  
  78
- D.
  
  49
Correct Answer
B. 60

Explanation
9*0.5 + 0.5 = 4.5 + 0.5 = 5
5*1 +1 = 5+1 =6
6*1.5 + 1.5 = 9+1.5 =10.5
10.5*2 + 2 = 21+2 = 23
23*2.5 + 2.5 = 57.5+2.5 = 60.

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10.

59, 66, 80, 108, ?, 276
- A.
  
  150
- B.
  
  125
- C.
  
  164
- D.
  
  132
Correct Answer
C. 164

Explanation
59 + 7 = 66
66 + 14 = 80
80+ 28 = 108
108 + 56 = 164

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11.

47, 23, 11, 5, 2, ?
- A.
  
  0.2
- B.
  
  0.5
- C.
  
  1
- D.
  
  1.5
Correct Answer
B. 0.5

Explanation
47*0.5 - 0.5= 23.5 - 0.5 = 23
23*0.5 - 0.5 = 11.5 - 0.5 =11
11*0.5 - 0.5 = 5.5 - 0.5 = 5
5*0.5 - 0.5 = 2.5 - 0.5 = 2
2*0.5 - 0.5 = 1 - 0.5 = 0.5

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12.

1, 2, 6, 21, 88, ?
- A.
  
  445
- B.
  
  615
- C.
  
  216
- D.
  
  539
Correct Answer
A. 445

Explanation
1*1 + 1 = 2
2*2 + 2 = 6
6*3 + 3 = 21
21*4 + 4 = 88
88*5 + 5 = 445

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13.

9, 10.8, 14.4, 21.6, ?, 64.8
- A.
  
  36
- B.
  
  44
- C.
  
  34
- D.
  
  37.6
Correct Answer
A. 36

Explanation
9 + 1.8 = 10.8
10.8 + (2*1.8) = 10.8 + 3.6 = 14.4
14.4 + (2*3.6) = 14.4+7.2 = 21.6
21.6 + (2*7.2) = 21.6 + 14.4 = 36

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14.

6, 5, 8, 21, 80, ?
- A.
  
  268
- B.
  
  192
- C.
  
  395
- D.
  
  364
Correct Answer
C. 395

Explanation
6*1 -1 = 5
5*2 - 2 = 10-2 =8
8*3 - 3 = 24-3 = 21
21*4-4 = 84-4 = 80
80*5-5 = 395

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15.

13, 6, 5, 6, 10, ?
- A.
  
  19
- B.
  
  25
- C.
  
  22.5
- D.
  
  17.5
Correct Answer
C. 22.5

Explanation
13*0.5 - 0.5 = 6.5-0.5 = 6
6*1 - 1 = 6-1 = 5
5*1.5 - 1.5 = 7.5 - 1.5 = 6
6*2 - 2 = 12-2 = 10
10*2.5 - 2.5 = 25-2.5 =22.5

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Current Version
Mar 20, 2023

Quiz Edited by
ProProfs Editorial Team
Aug 12, 2017

Quiz Created by
Ashwin

Number Series (Previous Year Questions )test -1

14, 8, 7, 11.5, 22, ?

8, 14, 25, 46, 82, ?

13, 14, 30, 93, ?, 1885

65, 70, 63, 74, 61, ?

11, 20, 38, 74, ?

15, 21, 38, 65, 101, ?

24, 28, 19, 35, 10, ?

7, 16, 45, 184, 915, ?

9, 5, 6, 10.5, 23, ?

59, 66, 80, 108, ?, 276

47, 23, 11, 5, 2, ?

1, 2, 6, 21, 88, ?

9, 10.8, 14.4, 21.6, ?, 64.8

6, 5, 8, 21, 80, ?

13, 6, 5, 6, 10, ?