Aptitude - Numbers - Discussion

Discussion Forum : Numbers - General Questions (Q.No. 1)
1.
Which one of the following is not a prime number?
31
61
71
91
Answer: Option
Explanation:
91 is divisible by 7. So, it is not a prime number.
Discussion:
113 comments Page 1 of 12.

Durga babu said:   5 days ago
91 is the correct answer.

Vishal VR said:   2 months ago
91 is the correct answer because they divided by 7 and 13.

TEJASWINI KUDAPU said:   3 months ago
Yes, I agree D is the correct answer.
(1)

GooduriJagadeesh said:   8 months ago
Thanks for explaining it.
(3)

Jagadeesh said:   8 months ago
The answer is 91.
(1)

Rakhi Sikdar said:   1 year ago
Yes, 91 is not a prime number.
(3)

Vishwanth said:   1 year ago
No, @Jitu,

71 will not be divisible by 3.
(4)

Anumoju sri ram said:   1 year ago
The prime number definition: the numbers which is divisible 1 and itself. or the number contains only 2 factors are prime numbers.

A.31 = 1,31 only 2 factors so it is a prime number.
B.61 = 1,61
C.71 = 1,71
D.91 = 1,7,13,91 In this option D there are more than 2 factors.
And 91 divisible 7 which is 13.
91/7= 13,
so, option D is the correct answer.
(42)

Ajeejul said:   2 years ago
91 is the correct answer.
(19)

Keshav said:   2 years ago
How to find the prime number?
(54)


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