Search found 411 matches

by Labib
Fri Feb 21, 2014 2:09 pm
Forum: Secondary Level
Topic: Even + Odd = Odd
Replies: 3
Views: 1750

Re: Even + Odd = Odd

@Sakib
But the problem says that $n$ can only be an odd integer greater than $1$. Why are you bothered about even values of $n$? :-|
by Labib
Fri Feb 21, 2014 2:04 pm
Forum: National Math Olympiad (BdMO)
Topic: BdMO National 2014: Junior 3
Replies: 1
Views: 1528

Re: BdMO National 2014: Junior 3

Here are some hints- Hint $1$: Did you notice that, \[(15*80)_{subrata_-minute} = (24*60)_{traditional_-minute}\] and, \[(10*80)_{subrata_-minute} = (16*60)_{traditional_-minute}\] From this information, can you deduce, $1$ $subrata_-minute$ = how many $traditional_-minute$? Hint $2$: (answer) If yo...
by Labib
Fri Feb 21, 2014 1:13 pm
Forum: National Math Olympiad (BdMO)
Topic: BdMO National 2014: Junior 10
Replies: 4
Views: 1907

Re: BdMO National 2014: Junior 10

Atiab, I've hardly used some English here. All the important things are written as equations. Try focusing on the maths instead of getting bothered with the English. I believe you'll be just fine. Still, if you have difficulty, let me know which step you didn't get. And, please post new problems in ...
by Labib
Fri Feb 21, 2014 1:12 pm
Forum: National Math Olympiad (BdMO)
Topic: BdMO National 2014: Junior 3
Replies: 1
Views: 1528

BdMO National 2014: Junior 3

Subrata has invented a new type of clock,according to which, there are $15$ hours in each day and $80$ minutes in each hour. For example Subrata's clock shows $10:00$ when the actual time is $16:00$ in a traditional clock. If the time is $20:36$ in a traditional clock, then what will be the time in ...
by Labib
Fri Feb 21, 2014 2:42 am
Forum: National Math Olympiad (BdMO)
Topic: BdMO National 2014: Junior 10
Replies: 4
Views: 1907

Re: BdMO National 2014: Junior 10

I'll give a step by step solution and I encourage everyone to think a lot before looking at the steps since it's an amazing problem. :) Step $1$: Most people actually do not understand what the problem is asking for (Even I did not get it at first). Let's define $d_i$ as the number of chocolates the...
by Labib
Fri Feb 21, 2014 1:54 am
Forum: Secondary Level
Topic: chocolate problem
Replies: 1
Views: 1272

Re: chocolate problem

Since it is a BdMO problem, I opened a different thread for it in the BdMO section so that everyone can find it easily.
Link to the thread : Junior $10$
by Labib
Fri Feb 21, 2014 1:52 am
Forum: National Math Olympiad (BdMO)
Topic: BdMO National 2014: Junior 10
Replies: 4
Views: 1907

BdMO National 2014: Junior 10

Oindri has $100$ chocolates. She finished eating all her chocolates in $58$ days by eating at least one chocolate each day. Prove that, in some consecutive days she eat exactly $15$ chocolates.
by Labib
Tue Feb 18, 2014 12:25 am
Forum: Primary Level
Topic: Can anyone help me finding the solution
Replies: 4
Views: 4078

Re: Can anyone help me finding the solution

Now that I look at this, my solution looks faulty. Please ignore it.
The problem has no solution. (Why? One of the sons' age has to 13 or 26, But setting these as a son's age, we cannot get any valid solution.)
by Labib
Tue Feb 11, 2014 11:28 pm
Forum: Secondary Level
Topic: giant prime
Replies: 3
Views: 1529

Re: giant prime

সংখ্যাতে 1 ছাড়া অন্য কোন অঙ্ক থাকতে পারবে না? (গঠন দেখে সেরকমই মনে হচ্ছে তবে স্টেটমেন্ট-এ পরিষ্কার বলা থাকলে ভাল হয়)
by Labib
Tue Feb 11, 2014 11:15 pm
Forum: Junior Level
Topic: Not hard, but...
Replies: 8
Views: 3104

Re: Not hard, but...

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? There was a typo in Hint $1$.Here's a corrected version. 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 $a_1$ a...