## Sunday, April 06, 2014

### Proving the method of finding whether a number is prime or not - Video Lecture

This video lecture is a continuation of my last video lecture in which I covered the basics of Prime Numbers. In the last video lecture I told you the basic properties of prime numbers and also the method how to find whether a number is prime or not. In the last lecture I started explaining the reasoning behind the method that I employed in order to find out whether a number is prime or not. In this video lecture I have continued explaining from the point where I have left last time.

If you have any doubts kindly post them in the comment section below. You can also submit your feedback regarding these videos. HAPPY STUDIES.........

1. SIR VERY INTERESTING AND VERY WELL YOU TOLD THE WHETHER THE NUMBER IS PRIME OR NOT
SIR MAZA AA GAYA
VERY
VERY THANKS SIR
I AM VERY GRATEFUL TO U SIR REALLY

2. very well .....thank you.

3. very well done sir ...thank you

4. sir, is 413 a prime number??? it is divisible by 7. so, is it a composite number????

5. yes amit 413 is not a prime number........it is a composite number....

6. sir u r helping us very much. veeeery thanx for such type of work. plz keep on it

7. very interesting nd nice concepts

8. keep up the good work sir. thanks alot.

9. sir,thank you soo much..........

10. Thanks for the help Sir.

11. sir u told that prime no. is the form of 6n+1 or 6n-1.
so , instead of using the square root method. can we only check the no. by dividing 6 ?
because u told that if we get remainder 1 or 5 then no. is prime.
so, i found this method easy or quick instead of that square root method.
so is that method (6n+1 or 6n-1) is applicable in all prime no. ?

1. He said if a number is prime it should be in the form of 6n+1 or 6n-1
He didn't say 6n+1 or 6n-1 guarantee you that number is always prime. Both statements are different. lets take an example to understand better . let check 55 a prime or not . We know its not prime but we can arrange it in the for of 6*9+1 .I hope you understood.

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