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 

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 

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 

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 

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 

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 

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 

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 

Answer is: APattern (1x3),(2x5),(3x7),(4x9),(5x11),(6x13),(7x15), So, 70 is wrong.
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