Aptitude SeriesPage 3
17. | Find out the wrong number in each sequence
4, 9, 19, 39, 79, 160, 319
| | (a)79 | | (b)160 | | (c)319 | | (d)19 |
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Answer is: BDouble the number and add 1 to it, to get the next number. So, 160 is wrong
18. | Find out the wrong number in each sequence
10, 14, 28, 32, 64, 68, 132
| | (a)32 | | (b)64 | | (c)68 | | (d)132 |
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Answer is: DAlternately, we add 4 and double the next.
So, 132 is wrong. It must be (68x2) = 136
Insert the missing numbers
19. | Find out the missing number in sequence
4, -8, 16, -32, 64, …..
| | (a)128 | | (b)-128 | | (c)132 | | (d)-132 |
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Answer is: BEach numbers are multiple of -2.
So, the required number is -128.
20. | Find out the missing number in sequence
5, 10, 13, 26, 29, 58, 61, ….
| | (a)-122 | | (b)122 | | (c)-124 | | (d)124 |
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Answer is: ANumbers are alternately multiplied by 2 and increased 3.
So, the missing number = 61x2 = 122
21. | Find out the missing number in sequence
11, 13, 17, 19, 23, 29, …
| | (a)30 | | (b)31 | | (c)32 | | (d)33 |
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Answer is: BAll number are prime 31
22. | Find out the missing number in sequence
16, 33, 65, 131, 261, ….
| | (a)520 | | (b)420 | | (c)523 | | (d)525 |
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Answer is: CMultiply by two and add one.
23. | Find out the missing number in sequence
3, 7, 6, 5, 9, 3, 12, 1, 15,….
| | (a)-1 | | (b)-5 | | (c)25 | | (d)30 |
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Answer is: AThere are two series, beginning respectively with 3 and 7. In one 3 is added and in another 2 is subtracted. The next number is 1-2 = -1
24. | Find out the missing number in sequence
15, 31, 63, 127, 255, …
| | (a)511 | | (b)540 | | (c)550 | | (d)560 |
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Answer is: AMultiple by two and add one.
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