Search found 411 matches

by Labib
Sat Feb 08, 2014 10:03 pm
Forum: National Math Olympiad (BdMO)
Topic: Junior 2011/7
Replies: 4
Views: 1835

Re: Junior 2011/7

Since it is a BdMO problem, please do check twice if the problem has already been posted before. Please also remember that all the problems of BdMO since 2011 have already been posted in the forum. Plus all the higher secondary problems of BdMO since 2007 have been posted before. This particular pro...
by Labib
Sat Feb 08, 2014 9:47 pm
Forum: Geometry
Topic: Asking suggesion for BdMO 2014
Replies: 3
Views: 1512

Re: Asking suggesion for BdMO 2014

There's no such thing called suggestion.
Try the past problems, see which sort of problems you cannot solve and read books on that topic.
Remember - "There's no shortcut to success" :)
by Labib
Sat Feb 08, 2014 9:26 pm
Forum: Junior Level
Topic: Triangular problem
Replies: 9
Views: 3180

Re: Triangular problem

And if nobody replies to post, instead of reposting, just post a reply to the post on your own asking for help again.
That will again make the thread visible in the "recent posts" section and hopefully somebody will answer then.
by Labib
Sat Feb 08, 2014 9:19 pm
Forum: Junior Level
Topic: Triangular problem
Replies: 9
Views: 3180

Re: Triangular problem

I don't understand what you are trying to say. I'm guessing, you could not find the previous post, so you re-posted the problem.
If I guessed correct, for your information, there's an option on the top-left of your screen called "view your posts".
You can find your previous posts there.
by Labib
Sat Feb 08, 2014 8:59 pm
Forum: Junior Level
Topic: Triangular problem
Replies: 9
Views: 3180

Re: Triangular problem

I fixed the solution. Guess Asif's solution was not right, but you could've waited for a solution or asked for help again in the same thread.
Anyway, I'll just ignore it and hope you'll be careful from the next time.
by Labib
Sat Feb 08, 2014 8:50 pm
Forum: Junior Level
Topic: Triangular problem
Replies: 9
Views: 3180

Re: Triangular problem

Oh! Read the statement wrong! But, I see you re-posted it.
Why did you do that? It was already answered yesterday here! :-s
by Labib
Sat Feb 08, 2014 8:40 pm
Forum: Junior Level
Topic: Triangular problem
Replies: 9
Views: 3180

Re: Triangular problem

geo.png As you can see in the figure, the angles with the same colour have the same magnitude. (Because the opposite sides are equal) So, it's not hard to notice that $\angle B = 2 \angle A$. Since, $AB = AC$, so $\angle C = \angle B = 2\angle A$. So, $\angle A + 2\angle A + 2 \angle A = 5\angle A ...
by Labib
Sat Feb 08, 2014 8:12 pm
Forum: Primary Level
Topic: number theory
Replies: 3
Views: 3379

Re: number theory

Two things to say here. 1. There is not enough information in this problem statement. 2. I don't know about others but I personally think, these sort of posts do not help the impression of this forum. I encourage people to discuss such problems with their teachers and friends and post here only if t...
by Labib
Sat Feb 08, 2014 7:58 pm
Forum: Secondary Level
Topic: I have a confusion in a problem of series .
Replies: 4
Views: 1672

Re: I have a confusion in a problem of series .

Hi everyone. Please practise posting full solutions/hints. Otherwise it will be no help to the person posting. Yes, the solution is $170$. Here's why- We have to consider $7$ residue classes here, $0, \pm 1, \pm 2, \pm 3$. We can only keep $1$ number from the $0$ residue class. If we keep a number f...
by Labib
Sat Feb 08, 2014 7:40 pm
Forum: Junior Level
Topic: Not hard, but...
Replies: 8
Views: 3104

Re: Not hard, but...

Here are some hints.
Let's define the $i$-th element of the sequence as $a_i$.
Hint $1$:
So, $\frac {a_1+a_2}2 = 1 \Rightarrow a_1+a_2 = 2$
and, $a_1,a_2 \geq 1$. Can you deduce the value of $a_0$ now?
Hint $2$:
Can you prove that, $a_i = a_{i-2} + 2$ for $i > 2$?