Search found 829 matches

by nafistiham
Fri Jan 18, 2013 5:13 pm
Forum: News / Announcements
Topic: Something about 'brilliant.org'
Replies: 1
Views: 2052

Re: Something about 'brilliant.org'

I really appreciate the decision. But, again the question is not about just rules or copyright. It is also about self respect. What is the site doing ? It is helping people to know about their capability. So, when one does his jobs in his brilliant account, he is testing himself. Is it just for gett...
by nafistiham
Thu Jan 17, 2013 10:48 pm
Forum: Number Theory
Topic: minimum please!
Replies: 8
Views: 3405

Re: minimum please!

Rafe wrote:$a,b,c,d,.....$ is a sequence.the number of products of $a,b,c,d,....$ is $2,3,4,5,....$ find the minimum value of a in natural number
How can a natural number have a limited number of products ?
Are you talking about factors ?
by nafistiham
Thu Jan 17, 2013 10:44 pm
Forum: Combinatorics
Topic: from 1 to 100
Replies: 8
Views: 3974

Re: from 1 to 100

Share it, kindly, then.
by nafistiham
Thu Jan 17, 2013 8:54 pm
Forum: Combinatorics
Topic: from 1 to 100
Replies: 8
Views: 3974

Re: from 1 to 100

i want the answer that how many answers will be same.for example $100$ can be got in $49$ ways, $99$ can be $50$ ways....i want the total sum. Let us see how much far I can go :? we can get, $5,6...197$ as same sums. $5,6;7,8;9,10;11,12;.........;99,100$ can be got in $2;3;4;5.......;49$ ways. now,...
by nafistiham
Thu Jan 17, 2013 11:23 am
Forum: Primary Level
Topic: গনিত নয় ধাঁধাঁ
Replies: 5
Views: 6520

Re: গনিত নয় ধাঁধাঁ

saminreja wrote:সংখ্যাগুলো হল : -2, -3, 4, 7, 8

Barisal Zilla School
কিন্তু, এখানে ঠিক কোনগুলোকে যোগ করলে $0$ হয় ?
by nafistiham
Thu Jan 17, 2013 11:18 am
Forum: Divisional Math Olympiad
Topic: Some problems of last year divisionals, I need help for
Replies: 36
Views: 12056

Re: Some problems of last year divisionals, I need hel for

More problems have arrived............ Dhaka Secondary 2012 $10.$ In the given diagram, both $ABC$ and $DBE$ are right triangles, $B$ being the right angle for both. They have hypotenuses of same length. $DE$ is perpendicular on $BC$. Area of $ABC$ is $\sqrt 3$ times of $DEF$. Find $\angle BDE$. Is...
by nafistiham
Thu Jan 17, 2013 9:51 am
Forum: Divisional Math Olympiad
Topic: Some problems of last year divisionals, I need help for
Replies: 36
Views: 12056

Re: Some problems of last year divisionals, I need hel for

More problems have arrived............ Dhaka Secondary 2012 $5.$There are some small stones in a box. Weight of each of the stones is an integer (in units of gram), weight of two different stones cannot be same. If you use them on one side of a scale, you can weigh any integer numbered weight upto $...
by nafistiham
Thu Jan 17, 2013 12:11 am
Forum: Divisional Math Olympiad
Topic: Some problems of last year divisionals, I need help for
Replies: 36
Views: 12056

Re: Some problems of last year divisionals, I need hel for

@Tiham vaia,the larger triangle $ABC$ is obtuse, and that means its circumcenter is outside. But we are not working on the circumcenter of $ABC$,rather on the circumcenter of $\triangle DEF$. oops... you are right and in the ababab problem, I have just copied from english. The bengali version says ...
by nafistiham
Wed Jan 16, 2013 10:28 pm
Forum: Social Lounge
Topic: Any Way
Replies: 11
Views: 5969

Re: Any Way

Fahim Shahriar wrote:After $S.S.C.$ we will have enough time. I hope it will be... But how can I know whether it will be held or not?
As far as I know, there is a less possibilty of holding an SSC camp. But, still don't lose hope and don't lose your eye on গনিত ইশকুল ;)
by nafistiham
Wed Jan 16, 2013 10:24 pm
Forum: Higher Secondary Level
Topic: factorial
Replies: 3
Views: 2425

Re: factorial

The prime factorization of $40320$ is : \[\displaystyle40320=2^7\times3^2\times5\times7\] Here, you can see that $7$ and $5$ occur only once in the factorization. So, $40320$ can be at least $7!$ and at most $9!$. But, in $9!$, $3$ occurs $3$ times. So, $n\neq9$. Now, if you check, $\displaystyle7!...