Search found 32 matches

by S_r
Sun May 12, 2019 7:00 pm
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 4999

Re: an old maths olympiad question

it is so easy to write anything on internet. i promise i will never write any stupid post or a nasty comment anywhere ever again. Please forgive me. i am sorry.
by S_r
Tue Sep 25, 2018 7:14 am
Forum: Recreational
Topic: Suggest me a book
Replies: 13
Views: 4555

Re: Suggest me a book

My "go to" book is "Elementary Number Theory" by David M. Burton. I don't even know where I got it from but the main thing I like about it is that the mathematical detail is interspersed with interesting historical details. Both "Prime Numbers: A Computational Perspective", Pomerance & Crandall, an...
by S_r
Tue Jul 10, 2018 4:17 am
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 4999

Re: an old maths olympiad question

please forgive me for those rude comments. I will never do that again :(
by S_r
Tue Jul 10, 2018 2:47 am
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 4999

Re: an old maths olympiad question

Then if some people take the time to look into your problems you start to be nasty. So I think it best not to pay attention anymore to these problems of yours. i didnt have any intention to be nasty. it was the complete helplessness. i couldnt solve them four years ago, i cant solve them now and if...
by S_r
Mon Jul 09, 2018 2:23 pm
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 4999

Re: an old maths olympiad question

So people here can't solve an Olympiad question
by S_r
Mon Jul 09, 2018 11:47 am
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 4999

Re: an old maths olympiad question

The answer is 7 but I don't know how :(
by S_r
Mon Jul 09, 2018 11:27 am
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 4999

Re: an old maths olympiad question

I can't still see it can you make it clear?
by S_r
Mon Jul 09, 2018 9:59 am
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 4999

Re: an old maths olympiad question

I take my thanks back
by S_r
Mon Jul 09, 2018 4:26 am
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 4999

Re: an old maths olympiad question

I don't know if what you think is right or wrong. unless you can prove it it ain't right. Until then I can't believe if has zero sides.
by S_r
Sat Jul 07, 2018 4:49 pm
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 4999

Re: an old maths olympiad question

kenbrooker wrote:
Sat Jul 07, 2018 10:22 am


And yes, I am interested in any other questions...
Other one: suppose A1A2A3....An is an n sided regular polygon such that :
1/A1A2= 1/A1A3 + 1/A1A4. Determine number of sides of the polygon.
by S_r
Sat Jul 07, 2018 4:47 pm
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 4999

Re: an old maths olympiad question

jaap wrote:
Sat Jul 07, 2018 2:58 pm
Whatever the missing question is, its answer probably relies on the fact that that polynomial can be written as
(n-2)(n-1)n(n+1)(n+2)(n+3)+3.
I have updated ot now. Is it my inexperience that I cannot see how to factor the polynomial?
by S_r
Sat Jul 07, 2018 3:38 am
Forum: Number
Topic: an old maths olympiad question
Replies: 28
Views: 4999

an old maths olympiad question

hey guys! today I found a question paper that is almost four years old. Our teacher chose four of us for this Olympiad. there were a total of 10 questions with total 100 marks. I couldn't solve any of them. I still cant solve them. I want your insights for one of the question. if you want I can post...
by S_r
Tue Apr 10, 2018 7:24 am
Forum: News, Suggestions, and FAQ
Topic: New Awards (10 April 2015)
Replies: 9
Views: 2470

Re: New Awards (10 April 2015)

A suggestion on awards.. Is there a possibility of introducing country-wise awards.. Something like 'First in your country', 'Top solver of your country' and something like that?? The Elite group is highly competitive to even make an attempt at getting some awards like 'The Gold Medal'. Would proba...
by S_r
Wed Apr 04, 2018 6:26 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 078
Replies: 16
Views: 5217

Re: Problem 078

this is an irritating question for me. even after euler's hint in thread of previous problems i cannot get it. what exactly is the trick i should look for as p(1000) using only primes is large number and i dont think i can go upto many digits with six zeroes at end. what should i do
by S_r
Thu Dec 28, 2017 2:18 pm
Forum: Number
Topic: A good number theory book?
Replies: 4
Views: 6968

Re: A good number theory book?

I know you must have learnt everything by now on number theory but I still would recommend you this "elementary number theory" a tata McGraw hill book
by S_r
Mon Dec 25, 2017 3:16 pm
Forum: Recreational
Topic: Best sort
Replies: 12
Views: 3391

Re: Best sort

Tell me if it is something remarkable
by S_r
Mon Dec 25, 2017 3:07 pm
Forum: Recreational
Topic: Best sort
Replies: 12
Views: 3391

Re: Best sort

We can take an array of size n+1 and simply assign a[n]=n and it will be sorted no comparison needed. Even if it is not from 1 to n and is within a range we can use a[n+minimum number]=n. Sorry for my english
by S_r
Sun Dec 24, 2017 9:34 am
Forum: Recreational
Topic: Best sort
Replies: 12
Views: 3391

Re: Best sort

Ten lakhs = a million. Sorry, I didn't know lakhs wasn't known to you
by S_r
Sun Dec 24, 2017 9:19 am
Forum: Recreational
Topic: Best sort
Replies: 12
Views: 3391

Best sort

Let there be a million numbers from one to million randomly placed in array, what is the minimum running time you can sort it in? I will reply at end. I really want everyone to give their answers
by S_r
Sun Dec 24, 2017 9:11 am
Forum: Number
Topic: Prime generation
Replies: 3
Views: 2507

Re: Prime generation

Anyone?