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:
110 comments Page 6 of 11.
NIDHIN M Z said:
9 years ago
2, 3, 5, 7.
1--1379.
2--39.
3--17.
4--137.
5--39.
6--17.
7--139.
8--39.
9--7.
These are the shortcuts for the prime number.
Lets see, 1--1379 means 11 is prime, 13 is prime, 17 is prime, 19 is prime.
Likewise 2--39 means 23 is prime, 29 is prime. This is the easy way to memorize the prime number. Its very easy (just you have to memorize the above given no).
1--1379.
2--39.
3--17.
4--137.
5--39.
6--17.
7--139.
8--39.
9--7.
These are the shortcuts for the prime number.
Lets see, 1--1379 means 11 is prime, 13 is prime, 17 is prime, 19 is prime.
Likewise 2--39 means 23 is prime, 29 is prime. This is the easy way to memorize the prime number. Its very easy (just you have to memorize the above given no).
Shivani said:
9 years ago
Please give brief explanation of prime numbers.
Revanna p said:
9 years ago
How does 91 come?
J.KRISHNAVENI said:
9 years ago
@Dilipkumar.
Only for few numbers given for short cut in prime numbers. So please given for other numbers in the short cut method.
Only for few numbers given for short cut in prime numbers. So please given for other numbers in the short cut method.
Shailesh said:
9 years ago
If the number is divisible by 2 and 3 both, then it is divisible by 6.
Akshay said:
9 years ago
Please, someone, know the method for divisibility of 6?
Shamanth said:
9 years ago
How can we find the number of prime numbers below 'n' numbers ?
Poojarani said:
10 years ago
Thank you @Santosh.
Hello said:
10 years ago
Thank you for explaining the problem.
Swati said:
10 years ago
@Dilipkumar(Cse).
Is there any method to find the prime number between 1 to 1000?
Is there any method to find the prime number between 1 to 1000?
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