Aptitude - Numbers - Discussion

Discussion Forum : Numbers - General Questions (Q.No. 1)
1.
Which one of the following is not a prime number?
31
61
71
91
Answer: Option
Explanation:
91 is divisible by 7. So, it is not a prime number.
Discussion:
107 comments Page 7 of 11.

Reshma said:   1 decade ago
Explain one example with 3 digit number?

Ramanna said:   10 years ago
What is prime number?

Ramanna said:   10 years ago
What is prime number?

Mahaboob basha said:   10 years ago
Hi friends I have a doubt please clear it.

What is the remainder when 1!+2!+3!+4!+5!+....+50! is divided by 5!?

Shailendra kumar said:   10 years ago
After 4! all the no is divisible by 5! so answer is (1+2+6+24)/6 = 33/6 = 3 (rem).

Shilpa said:   10 years ago
1!+2!+.....50!/5!

= (1!+2!+......+50!) /1!+2!+.....+5!

= 6!+7!+....+50!

Narender reddy said:   10 years ago
I want to clear explanation prime no's and not prime no's.

Mahalakshmi said:   9 years ago
What is prime numbers how we have have to do calculation? Please explain me in detail.

Dhruba said:   9 years ago
Sorry, I can't understand. Can anyone explain the answer with an easy method?

Swati said:   9 years ago
@Dilipkumar(Cse).

Is there any method to find the prime number between 1 to 1000?


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