Number Series Test 2 (1.5 Minutes Per Question)
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Questions and Answers
- 1.
In the following number series only one number is wrong. Find the wrong number.130 129 154 203 284 405
- A.
130
- B.
129
- C.
154
- D.
203
- E.
284
- F.
405
Correct Answer
A. 130Explanation
154 - 129 = 25 = 5*5
203 - 154 = 49 = 7*7
284 - 203 = 81 = 9*9
405 - 284 = 121 =11*11
but when we see the first two terms from left side
129 -130 = 1 = 1*1 and hence we can say that the odd term is 130 as it should be 120Rate this question:
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- 2.
20 10 12 15 30 75 225
- A.
Option 130
- B.
15
- C.
12
- D.
75
- E.
225
Correct Answer
C. 12Explanation
20*0.5 = 10
10*1 = 10 (Given as 12 in the question)
10*1.5=15
15*2 = 30
30*2.5 = 75 and so on.
12 is the wrong term in the series.Rate this question:
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- 3.
39 43 51 60 87 110 167
- A.
39
- B.
43
- C.
51
- D.
60
- E.
87
- F.
110
Correct Answer
F. 110Explanation
This question has a very interesting pattern ,
43 - 39 = 4 = 2*2
51- 43 =8 = 2*2*2
60 - 51 = 9 = 3*3
87 - 60 = 27 = 3*3*3
As we can see that differences between consecutive terms are of the form 2square, 2 cube, 3 square, 3 cube....
So after 87 we should have 87 + 4 square = 87 + 16 = 103 (Given as 110 in the question)
y - 87 = 16 = which implies y = 103
But the number given is 110 and hence 110 is the odd one out .Rate this question:
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- 4.
3 4 12 45 198 1005 6066
- A.
4
- B.
6066
- C.
45
- D.
198
Correct Answer
D. 198Explanation
3*1 + 1 = 4
4*2 + 4 = 12
12*3 + 9 = 36 + 9 = 45
45*4 +16 = 196 (given as 198 in the question)
The pattern is *1 + 1 square, *2 + 2 square, *3 + 3 square, etc...Rate this question:
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- 5.
What will come in place of the question mark (?) in the given number series ?123, 140, 106, 157, 89, ?
- A.
214
- B.
139
- C.
169
- D.
174
Correct Answer
D. 174Explanation
123 +17 = 140
140-34 = 106
106+ 51 = 157
157- 68=89
89 + 85 = 174.Rate this question:
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- 6.
190, 94, 46, 22, ?, 4
- A.
19
- B.
15
- C.
10
- D.
8
Correct Answer
C. 10Explanation
190*0.5 - 1 = 94
94*0.5 - 1 = 46
46*0.5 - 1 =22
22*0.5 - 1 =10.Rate this question:
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- 7.
320, 308, 284, 236, 140, ?
- A.
-52
- B.
-50
- C.
92
- D.
114
Correct Answer
A. -52Explanation
320-12 = 308
308 - 24 = 284
284-48 = 236
236 - 96 = 140
140 - 192 = -52.Rate this question:
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- 8.
3, 4, 9, 28, 113, ?
- A.
566
- B.
384
- C.
424
- D.
646
Correct Answer
A. 566Explanation
3*1+1 = 3+1= 4
4*2 + 1 = 8+1 = 9
9*3 + 1 = 27+1 = 28
28*4+1 = 112+1 = 113
113*5 + 1 = 565 + 1 = 566Rate this question:
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- 9.
8, 4, 6, 15, ?, 236.25
- A.
52.5
- B.
36
- C.
64.5
- D.
84
Correct Answer
A. 52.5Explanation
8 * 0.5 = 4
4 * 1.5 = 6
6 * 2.5 = 15
15 * 3.5 = 52.5Rate this question:
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- 10.
95, 115.5, 138, ? , 189
- A.
154.5
- B.
164.5
- C.
162.5
- D.
166.5
- E.
None of these
Correct Answer
C. 162.5Explanation
The pattern is +20.5, +22.5, +24.5, +26.5, ....Rate this question:
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Current Version
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Mar 16, 2023Quiz Edited by
ProProfs Editorial Team -
Aug 14, 2017Quiz Created by
Ashwin
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