Aptitude SeriesPage 5
33. | Find out wrong number in this series
2880, 480, 92, 24, 8, 4, 4
| | (a)92 | | (b)24 | | (c)8 | | (d)4 |
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Answer is: ADividing 6, 5, 4, 3, 2, 1, respectively, So 92 is wrong
34. | Find out wrong number in this series
445, 221, 109, 46, 25, 11, 4
| | (a)46 | | (b)25 | | (c)11 | | (d)4 |
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Answer is: ASubtracting 3 and dividing 2 So, 46 is wrong
(445-3)/2 = 221
(221-3)/2 = 109
(109-3)/2 = 53
35. | Find out wrong number in this series
1, 3, 10, 21, 64, 129, 356, 777
| | (a)64 | | (b)129 | | (c)356 | | (d)777 |
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Answer is: C(1x2+1)= 3
(3x3+1) = 10
(10x2+1) = 21
(21x3+1) = 64;….. so, 356 is wrong
36. | Find out wrong number in this series
196, 169, 144, 121, 100, 80, 64
| | (a)121 | | (b)100 | | (c)80 | | (d)64 |
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Answer is: CAll of these are squares except 80.
37. | Find out wrong number in this series
789, 645, 545, 481, 440, 442, 429, 425
| | (a)440 | | (b)442 | | (c)429 | | (d)425 |
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Answer is: A2nd term = 1st term - (12) ² = 789 – 144 = 645
3rd term = 2nd term – (10) ² = 645 – 100 = 545
4th term = 3rd term – (8)² = 545 – 64 = 481
And so on…. So, 440 is wrong.
38. | Find out wrong number in this series
1050, 510, 242, 106, 46, 16, 3
| | (a)3 | | (b)6 | | (c)46 | | (d)106 |
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Answer is: D2nd term = (1050-30)/2 = 510
3rd term = (510-26)/2 = 242
4th term = (242-22)/2 = 110
So, 106 is wrong
39. | Find out wrong number in this series
888, 440, 216, 104, 48, 22, 6
| | (a)104 | | (b)440 | | (c)22 | | (d)6 |
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Answer is: C2nd term = (888-8)/2 =440
3rd term = (440-8)/2 = 216
4th term = (216-8)/2 = 104
5th term = (104-8)/2 = 48
6th term = (48-8)/2 = 20
So, 22 is wrong.
40. | Find the next number.
180, 179, 171, 144, ?
| | (a)80 | | (b)70 | | (c)60 | | (d)50 |
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Answer is: A180 – 1 = 179
179 – 8 = 171
171 – 27 = 144
144 – 64 = 80
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