Search found 829 matches

by nafistiham
Sun Jan 27, 2013 1:19 pm
Forum: Junior Level
Topic: 2007 National, Junior 11
Replies: 2
Views: 8248

Re: 2007 National, Junior 11

It is also in mathematical quickies and গনিতের মজা মজার গণিত ।
the solution is like this.

\[a^{2}+b^{2}+c^{2}=ab+bc+ca\]
\[2a^{2}+2b^{2}+2c^{2}=2ab+2bc+2ca\]
\[(a-b)^{2}+(b-c)^{2}+(c-a)^{2}=0\]
\[a=b=c\]
by nafistiham
Fri Jan 25, 2013 2:18 pm
Forum: Secondary Level
Topic: a problem from the textbook
Replies: 3
Views: 2086

Re: a problem from the textbook

for $\ln(x)$, $x$ can not be negative. So, $x>0$ is the domain. for more, see the Graph or visit Wikipedia. And about equation editor, I think something is going wrong. You may bookmark it . Moreover, you could just use two $ around the equation and latex it. It is so easy. equation editor won't hel...
by nafistiham
Fri Jan 25, 2013 1:13 pm
Forum: Social Lounge
Topic: Please notice...
Replies: 1
Views: 1469

Please notice...

নতুন সদস্যদের একটু দৃষ্টি আকর্ষণ করছি । কোন পোস্ট করার সময় বা কমেন্ট করার সময় লেখার ভাষার দিকটায় একটু নজর দিবেন । লেখাটা যথাসম্ভব বাংলায় বা ইংরেজিতে লিখলে ভাল হয় । এটা ঠিক যে, আমরা অনেক সময়ই ইংরেজিতে অনুবাদ করে লিখতে পারি না বা ভুল হয় । সেক্ষেত্রে শুধু সেসব অংশটুকু ইংরেজি লেখায় বাংলা উচ্চারন...
by nafistiham
Fri Jan 25, 2013 12:56 pm
Forum: Junior: Solved
Topic: Dhaka Junior 2011/9
Replies: 7
Views: 7230

Re: Dhaka Junior 2011/9

Shafin wrote:
nafistiham wrote:$BD=2$
$DE=DO+OE=DO+DO=AC=3$
$BE^2=BD^2+DE^2=13$
Can u draw it on a paper and then upload the image with positions of all e points? I cant understand the position of e
Sorry for being so late. :oops: :oops:
here is what you wanted.
junior 2011-9.png
there is something called 'extension' :p
junior 2011-9.png (18.07 KiB) Viewed 6485 times
by nafistiham
Fri Jan 25, 2013 1:40 am
Forum: Number Theory
Topic: minimum please!
Replies: 8
Views: 3411

Re: minimum please!

Fahim Shahriar wrote:I think you're talking about this sequence
$2,4,8,16.....,2^n$

$2^n$ has $(n+1)$ factors.
I think that is it. And, so, $a=2$
by nafistiham
Fri Jan 25, 2013 1:29 am
Forum: Physics
Topic: will it come back
Replies: 9
Views: 4081

Re: will it come back

suppose i have a ball having the same mass of the earth.i throw it in the sky.will it come back? তোমার প্রশ্ন যদি এ বিষয়ে হয়, যে পৃথিবী বলের দিকে যাবে না, বল পৃথিবীর দিকে আসবে, তাহলে বলব যে, দুটোই একটা আরেকটার দিকে সমবেগে আগাবে । আর বল পৃথিবীর মিলন হওয়ার বিষয়টা হল, মুক্তিবেগ । যদি মুক্তিবেগের ব...
by nafistiham
Fri Jan 25, 2013 1:17 am
Forum: Social Lounge
Topic: Help...!!!...
Replies: 2
Views: 1580

Re: Help...!!!...

Big brothers,help me.i am a student of class 9.ami mathematics er vokhto and ami gonit olympiad a participate korte chai.but the problem is i dont know how to prepare me for this.ami onek ebooks download korsi,tarik vhai,samin vhai er poramorsho moto try korchi kintu kono kulkinara korte partasi na...
by nafistiham
Wed Jan 23, 2013 2:17 pm
Forum: Introductions
Topic: New Member Here
Replies: 4
Views: 3333

Re: New Member Here

Welcome zeeshan and MarkHolland to the forum. :D :D
by nafistiham
Mon Jan 21, 2013 11:42 pm
Forum: Physics
Topic: Round in Shape
Replies: 1
Views: 1643

Re: Round in Shape

The short answer is, each and every particle in this universe tries to be potential-less. When you think about things like stars, planets, natural satellites, think about the gravitation force that is working. everything wants to go to the centre, as mush as possible. If they were in cubic shape, th...
by nafistiham
Sun Jan 20, 2013 11:54 pm
Forum: Combinatorics
Topic: from 1 to 100
Replies: 8
Views: 3980

Re: from 1 to 100

Rafe wrote:We can take $\displaystyle \binom {100}{2}=4950$ pairs. Now the least result is $1+2=3$ and the greatest is $100+99=199$. So only $197$ results are different and $4950-197$ results are same.
That was easy !! :oops: :oops: