Two reasons:
1. To let know that he solved it.
2. To check if it's correct. Though I guess most of them do not submit solutions that they are confused with. So, point 1 is the only reason in most cases.. xD
Search found 61 matches
- Mon Feb 14, 2011 6:07 pm
- Forum: National Math Olympiad (BdMO)
- Topic: BdMO National Higher Secondary 2011/8
- Replies: 18
- Views: 11802
- Sun Feb 13, 2011 6:01 pm
- Forum: National Math Camp
- Topic: Bangladesh National Math Camp 2011
- Replies: 13
- Views: 9871
Re: Bangladesh National Math Camp 2011
Ans 1: He is leaving for South Korea to carry out higher studies. Ans 2: Most likely. That criteria of selection still works. If someone is out there adept of being in the camp, he/she will be valued. Ans 3: The tentative schedule has luckily changed. It will not begin on March 1 probably 4. (still ...
- Sun Jan 30, 2011 1:22 pm
- Forum: H. Secondary: Solved
- Topic: Dhaka Higher Secondary 2011/7
- Replies: 5
- Views: 11424
Re: Dhaka Higher Secondary 2011/7
My approach was pretty much like this: If Arjun wins in $n + 1$ shots the probability of his winning is = $\left( \frac{3}{5} \right)^n\frac{2}{5}$ If Karna wins while Arjun will fail the probality is = $\frac{3}{5} \left( \frac{x-p}{x} \right)^n\frac{p}{x}$( where p = probability of karan winning) ...
- Sun Jan 30, 2011 1:06 pm
- Forum: H. Secondary: Solved
- Topic: Dhaka Higher Secondary 2011/6
- Replies: 1
- Views: 2884
Re: Dhaka Higher Secondary 2011/6
Let A be the intersecting point of the common tangent and the radius of large circle that is touching the small circle. B be the internal touching point of the two circles and E be the tangency point of the smaller circle with the larger radius. C is the centre of large circle and D is the centre o...
- Sun Jan 30, 2011 12:43 pm
- Forum: H. Secondary: Solved
- Topic: Dhaka Higher Secondary 2011/9
- Replies: 11
- Views: 19616
Re: Dhaka Higher Secondary 2011/9
I mean he is one of them who wrote 0 in answer.
- Sun Jan 30, 2011 12:30 pm
- Forum: H. Secondary: Solved
- Topic: Dhaka Higher Secondary 2011/9
- Replies: 11
- Views: 19616
Re: Dhaka Higher Secondary 2011/9
Yeah the camper is Mugdho and the answer was guessed during olympiad.
- Sun Jan 30, 2011 12:23 pm
- Forum: H. Secondary: Solved
- Topic: Dhaka Higher Secondary 2011/10
- Replies: 4
- Views: 10477
Re: Dhaka Higher Secondary 2011/10
$\triangle ABC$ = $\triangle APC$ + $\triangle BPC$ + $\triangle BPA$ = $\frac {1}{2}$ $AC.1$ + $\frac{1}{2}.BC.2$ + $\frac{1}{2}AB.3$= $\frac{1}{2}AB.BC$ So, $AB$ =$\frac {AC}{BC}$ + 2$\frac {BC}{BC}$ + 3$\frac{AB}{AC}$ By simple angle chasing we will get $\angle ACB$ = 60 = sec 60 +2 + 3 tan 60 =...
- Sat Jan 22, 2011 2:23 pm
- Forum: Site Support
- Topic: নীল রঙের আধিক্য :(
- Replies: 12
- Views: 9099
Re: নীল রঙের আধিক্য :(
সমস্যা হচ্ছে প্রথমটা বেশি ভালো না হইলেও বাকিদের তুলনায় ভালো। আরো কিছু অপশন থাকলে এই তিনটার একটাও পছন্দ করতাম না। তিন নম্বরের ধরণটা ভালো (মানে আর্টিস্টিক ক্যাটাগরীটা ভালো) কিন্তু যেই ছবিটা দিসো ওইটা তেমন ভালো না। আউটলুক ডিজাইনে আমি একটু সাহায্য করতে পারি (যদি অ্যাডমিন চায়) কিন্তু এখন না। আপাতত যা আ...
- Fri Jan 21, 2011 10:12 am
- Forum: Site Support
- Topic: নীল রঙের আধিক্য :(
- Replies: 12
- Views: 9099
Re: নীল রঙের আধিক্য :(
প্রথমটা।
Umm... One more thing.
I didn't find the logo standard enough. Nevermind. আমি কিছুদিন আগে একটা লোগো বানাইসিলাম কিন্তু আর দেখালাম না কি মনে করে।
Umm... One more thing.
I didn't find the logo standard enough. Nevermind. আমি কিছুদিন আগে একটা লোগো বানাইসিলাম কিন্তু আর দেখালাম না কি মনে করে।
- Fri Dec 24, 2010 10:37 pm
- Forum: Geometry
- Topic: New geo: prove $OM$ passes through midpoint
- Replies: 6
- Views: 5008
Re: New geo: prove $OM$ passes through midpoint
কি জানি। :S
I will check again
I will check again