Aptitude SeriesPage 2
9. | Find out the wrong number in each sequence
46080, 3840, 384, 48, 24, 2, 1
| | (a)46080 | | (b)384 | | (c)48 | | (d)24 |
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Answer is: DThe terms are respectively divided by 12, 10, 8, 6, 4, 2 but 24 is wrong.
10. | Find out the wrong number in each sequence
56, 72, 90, 110, 132, 150
| | (a)110 | | (b)132 | | (c)72 | | (d)150 |
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Answer is: DNumbers (7x8),(8x9),(9x10),(10x11),(11x12),(12x13) ,So 150 is wrong.
11. | Find out the wrong number in each sequence
25, 36, 49, 81, 121, 169, 225
| | (a)25 | | (b)36 | | (c)49 | | (d)81 |
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Answer is: BSquare of odd numbers except 36.
12. | Find out the wrong number in each sequence
105, 85, 60, 30, 0, -45, -90
| | (a)85 | | (b)60 | | (c)30 | | (d)0 |
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Answer is: DSubtract 20, 25, 30, 35, 40,45, So 0 is wrong.
13. | Find out the wrong number in each sequence
125, 127, 130, 135, 142, 153, 165
| | (a)165 | | (b)153 | | (c)142 | | (d)135 |
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Answer is: APrime numbers 2, 3, 5, 7, 11, 13 are to be added successively. So, 165 is wrong
14. | Find out the wrong number in each sequence
16, 36, 64, 81, 100, 144, 190
| | (a)81 | | (b)100 | | (c)144 | | (d)190 |
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Answer is: DAll numbers are square except 190.
15. | Find out the wrong number in each sequence
125, 123, 120, 115, 108, 100, 84
| | (a)120 | | (b)115 | | (c)108 | | (d)100 |
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Answer is: DPrime numbers 2, 3, 5, 7, 11, 13 have successively been subtracted.
So, 100 is wrong. It must be (108 - 11) = 97
16. | Find out the wrong number in each sequence
3, 10, 21, 36, 55, 70, 105
| | (a)70 | | (b)55 | | (c)36 | | (d)21 |
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Answer is: APattern (1x3),(2x5),(3x7),(4x9),(5x11),(6x13),(7x15), So, 70 is wrong.
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