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 3 of 5.
Diya said:
8 years ago
Here, 7 and 13 are the factors of 97. Then how it is prime?
Aditya said:
8 years ago
31 * 3 = 93 that's why 97 is prime.
Malik said:
8 years ago
How it is prime number?
Deekshi said:
8 years ago
Prime Number means having only 2 factors those are 1 and it self. So 97 is a prime number.
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
Viki said:
1 decade ago
Because 97 is not divided by 3. Other numbers are divided by 3 so the answer is 97.
Balram said:
1 decade ago
Because it is not disible any other no.
Divi said:
1 decade ago
I can't get you.
Niranjan Nande said:
1 decade ago
Please take any perfect square near of 97 i.e 10*10=100. Now find all prime numbers which are less than 10 that are 3,5,7.Now at last check wheather 97 is divisible by 2,3,7.If it is divisible then number is not prime else it is prime.
Ginu said:
1 decade ago
97 is a prime number.
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