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 

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 

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, â€¦..
 (a)128  (b)128  (c)132  (d)132 

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, â€¦.
 (a)122  (b)122  (c)124  (d)124 

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, â€¦
 (a)30  (b)31  (c)32  (d)33 

Answer is: BAll number are prime 31
22.  Find out the missing number in sequence
16, 33, 65, 131, 261, â€¦.
 (a)520  (b)420  (c)523  (d)525 

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,â€¦.
 (a)1  (b)5  (c)25  (d)30 

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 12 = 1
24.  Find out the missing number in sequence
15, 31, 63, 127, 255, â€¦
 (a)511  (b)540  (c)550  (d)560 

Answer is: AMultiple by two and add one.
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