Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 9)
9.
Which of the following is a prime number ?
Answer: Option
Explanation:
Clearly, 97 is a prime number.
Discussion:
47 comments Page 5 of 5.
Yogesh said:
4 years ago
No, it's divided by 7 it is not a prime number.
(4)
Abdulmajid Ma'aji katsina said:
4 years ago
Thanks all for explaining it.
(1)
Rishi said:
4 years ago
97 is the answer because we can't divide this number with any prime number.
(3)
Ganesh Barik said:
3 years ago
Thanks all for explaining the answer clearly.
(1)
Subhankar Banik said:
3 years ago
Good Explanation! Thanks all.
(1)
Naina Bhardwaj said:
3 years ago
Good explanation,Thanks @Viki.
(2)
ARUN said:
2 weeks ago
An easy way to find a number is prime or not.
Divide the number by 6 and check whether the reminder is +1 or -1. Then the number is a prime number.
formula : 6(x)(+-)plus or minus 1 .
Example:
97 is prime or not.
97/6=6(16)+1=>96+1=97 it is prime number. //ends with +1 or -1
41 is prime or not.
41/6=6(8)-1=> 42-1=41 it is prime number //ends with +1 or -1
Divide the number by 6 and check whether the reminder is +1 or -1. Then the number is a prime number.
formula : 6(x)(+-)plus or minus 1 .
Example:
97 is prime or not.
97/6=6(16)+1=>96+1=97 it is prime number. //ends with +1 or -1
41 is prime or not.
41/6=6(8)-1=> 42-1=41 it is prime number //ends with +1 or -1
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