Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 1)
1.
Which one of the following is not a prime number?
Answer: Option
Explanation:
91 is divisible by 7. So, it is not a prime number.
Discussion:
105 comments Page 1 of 11.
Monisha Mohanan said:
3 years ago
@All.
Prime number means that a number that is divisible only by itself and 1
Examples : 2,3,5,7,11.
Now in our question the options s 31, 61,71 and 91 here I think in our example we can find that the prime numbers only start with 2,1,3,5,7.
Thus the answer becomes 91.
Prime number means that a number that is divisible only by itself and 1
Examples : 2,3,5,7,11.
Now in our question the options s 31, 61,71 and 91 here I think in our example we can find that the prime numbers only start with 2,1,3,5,7.
Thus the answer becomes 91.
(56)
Sharma said:
4 years ago
91 prime or not.
Which square number is exceeds 91?
10 ^2 right. So let's take a prime number which is less than 10.
2, 3, 5, 7.
Check the given number is divisible by 2, 3, 5, 7.
If it is divisible then it is not a prime number.
If not that would be a prime number.
Which square number is exceeds 91?
10 ^2 right. So let's take a prime number which is less than 10.
2, 3, 5, 7.
Check the given number is divisible by 2, 3, 5, 7.
If it is divisible then it is not a prime number.
If not that would be a prime number.
(43)
Keshav said:
10 months ago
How to find the prime number?
(38)
Sindhuja B said:
4 years ago
The Question is "which is not a prime number".
In a very simple way how do we check whether a number is prime or not, .
The number should be divisible by one & the number it self right!.
Now see their options, that are, .
31. - is a prime number which can only be divided 1 & the number itself.
61. - same here.
71. - here too.
91. - is divisible by 1, 7, 91.
So, among other options, 91 is not a prime number.
In a very simple way how do we check whether a number is prime or not, .
The number should be divisible by one & the number it self right!.
Now see their options, that are, .
31. - is a prime number which can only be divided 1 & the number itself.
61. - same here.
71. - here too.
91. - is divisible by 1, 7, 91.
So, among other options, 91 is not a prime number.
(26)
Vishala said:
2 years ago
Thank you all for explaining the answer.
(18)
Jitu said:
4 years ago
Why only 91 is not a prime number?
In this case, 71 is also divisible by 3.
In this case, 71 is also divisible by 3.
(13)
Ajeejul said:
7 months ago
91 is the correct answer.
(11)
Amare muluken said:
2 years ago
Thanks all for explaining the answer.
(10)
Kakrla mallikarjuna rao said:
2 years ago
I think B is the correct answer.
(8)
Jaanu Jaanu said:
3 years ago
Thanks both of you for the clear explanations. @Hafiz and@ Dilip.
(7)
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