AMCAT Aptitude Preparation Questions with answers and explanation | Important Questiions

AMCAT DETAILS comes again with another compilation of Quantitative questions which are important or comes in AMCAT exam. So prepare well and score well.

Question: Find the odd man out
125, 106, 88, 76, 65, 58, 53

A. 125
B. 106C.88D. 76
Answer: (c)

Detailed explanation:
A series of prime numbers starting from 5 are added with every number to get the next number
See the pattern:
53+5 =5858+7= 6565+11=7676+13 =8989+17=106106+19 = 125
It must be 89 instead of 88.
So c is the answer.

Question: Insert the missing number.11, 13, 17, 19, 23, 29, 31, 37, 41, (....)
A. 43
B. 47C. 53D. 51

Answer: (a)

Detailed Explanation:
They are a series of prime numbers:
11 13 17 19 23 29 31 37 41 '43' 
Therefore the answer is 43

Question: Find the odd man out5, 15, 30, 135, 405, 1215, 3645A. 3645
B. 1215C. 405
D. 30
Answer: (d)

Detailed Explanation:
5*3=1515*3=4545*3=135135*3=405405*3=1215....
It must be 45 instead of 30.
So the answer is b.

Question: Find the odd man out.
3, 5, 7, 12, 17, 19
a) 19
b) 17
c) 5
d) 12

Answer: d)

Detailed Explanation: 
Every number in the given series is odd and prime number except 12
Since, 12 is only an even and non prime number in this
The answer is d.

Question: Which one of the following is not a prime number?
A. 31
B. 61
C. 71
D. 91

Answer : (d)

Detailed Explanation:
Every number given in options have no factors other than one and itself except 91.
91 is not a prime No. which is divisible by 1,7, 13 and 91
Therefore the answer to this question is d.