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:
107 comments Page 8 of 11.
Hello said:
9 years ago
Thank you for explaining the problem.
Poojarani said:
9 years ago
Thank you @Santosh.
Shamanth said:
9 years ago
How can we find the number of prime numbers below 'n' numbers ?
Akshay said:
9 years ago
Please, someone, know the method for divisibility of 6?
Shailesh said:
9 years ago
If the number is divisible by 2 and 3 both, then it is divisible by 6.
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.
Revanna p said:
9 years ago
How does 91 come?
Shivani said:
9 years ago
Please give brief explanation of prime numbers.
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).
Nagasai said:
9 years ago
If the number is 91 when we divide by 2 it is equal to 45.5 numbers in between 45.5 to 91 cannot exactly divide 91 except itself so when we take below that numbers 45.5. It is easy to tell given is prime or not.
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