Search found 90 matches
- Thu Aug 04, 2016 7:50 pm
- Forum: Algebra
- Topic: The Trig Calculator
- Replies: 1
- Views: 2180
The Trig Calculator
A calculator is broken so that the only keys that still work are the $ \sin$, $ \cos$, and $ \tan$ buttons, and their inverses (the $ \arcsin$, $ \arccos$, and $ \arctan$ buttons). The display initially shows $ 0$. Given any positive rational number $ q$, show that pressing some finite sequence of b...
- Thu Aug 04, 2016 7:48 pm
- Forum: Combinatorics
- Topic: Tennis League (USAMO 1989)
- Replies: 3
- Views: 3342
Tennis League (USAMO 1989)
The 20 members of a local tennis club have scheduled exactly 14 two-person games among themselves, with each member playing in at least one game. Prove that within this schedule there must be a set of 6 games with 12 distinct players.
- Thu Aug 04, 2016 7:29 pm
- Forum: Social Lounge
- Topic: Chat thread
- Replies: 53
- Views: 80083
Re: Chat thread
Welcome, Zahin (and Raiyan)! Tell us, how did you guys get interested in math? And how do we use that info to force encourage new people to join?
- Wed Aug 03, 2016 7:49 pm
- Forum: Social Lounge
- Topic: Chat thread
- Replies: 53
- Views: 80083
Re: Chat thread
#make_BdMO_forum_great_again
We're gonna make a wall, and we'll get the bashers to pay for it!
We're gonna make a wall, and we'll get the bashers to pay for it!
- Fri Jul 29, 2016 8:17 am
- Forum: Social Lounge
- Topic: Chat thread
- Replies: 53
- Views: 80083
Chat thread
This is a thread to just talk about whatever you want! Let' try to make the forum a bit less dead, shall we?
To start, tell us who you are! I'm Zawad, from Chittagong. And right now I'm really confused why this awesome forum is so dead
To start, tell us who you are! I'm Zawad, from Chittagong. And right now I'm really confused why this awesome forum is so dead
- Fri Jul 29, 2016 8:08 am
- Forum: Social Lounge
- Topic: A frequently asked question (FAQ)
- Replies: 3
- Views: 3904
Re: A frequently asked question (FAQ)
No, protractors are not allowed.Ragib Farhat Hasan wrote:Is protractor allowed in IMO?asif e elahi wrote:Of course. But set square is not allowed in IMO.
- Sat Aug 29, 2015 6:07 pm
- Forum: National Math Camp
- Topic: Exam 2, Online Number Theory Camp, 2015
- Replies: 24
- Views: 22051
Re: Exam 2, Online Number Theory Camp, 2015
Couldn't submit answers due to power failure :/ Can anyone give any tips on how to type out solutions faster?
btw, Vieta Jumping can direct you to the solution for number 4 but I didn't have to use it directly in the solution.
btw, Vieta Jumping can direct you to the solution for number 4 but I didn't have to use it directly in the solution.
- Fri Aug 28, 2015 3:56 pm
- Forum: National Math Camp
- Topic: Exam 2, Online Number Theory Camp, 2015
- Replies: 24
- Views: 22051
Re: Exam 2, Online Number Theory Camp, 2015
ঘাত - কি Power বুঝাচ্ছে?
- Sun Apr 26, 2015 4:56 pm
- Forum: Introductions
- Topic: O hai all!
- Replies: 3
- Views: 8840
O hai all!
I solemnly swear that I'm up to no good
- Tue Dec 03, 2013 9:24 pm
- Forum: Combinatorics
- Topic: Identity
- Replies: 3
- Views: 3898
Re: Identity
Let $\color{red}{k}$ be the number of all students, $\color{red}{n}$ be the number of regional winners, $m$ be the number of national winners. We can choose regional winners from all participants in $\binom{n}{k}$ ways and national winners from regional winners in $\binom{k}{m}$ ways. Again we can ...