## Search found 829 matches

- Thu Feb 05, 2015 9:51 pm
- Forum: Secondary Level
- Topic: Practice Problem Set for National (Secondary Category)
- Replies:
**2** - Views:
**1439**

### Practice Problem Set for National (Secondary Category)

I am posting here a practice problem set for Secondary level students. Happy practising

- Thu Feb 05, 2015 9:39 pm
- Forum: Junior Level
- Topic: Practice Problem Set for National (Junior Category)
- Replies:
**0** - Views:
**1275**

### Practice Problem Set for National (Junior Category)

I am posting here a practice problem set for junior level students. Happy practicing

- Sun Feb 10, 2013 6:09 pm
- Forum: Social Lounge
- Topic: বইমেলায় গণিত অলিম্পিয়াড
- Replies:
**9** - Views:
**4172**

### Re: বইমেলায় গণিত অলিম্পিয়াড

Don't know about Math Foundation. But, this time there is no stall named "গনিতের বই"

- Thu Feb 07, 2013 11:21 pm
- Forum: Secondary Level
- Topic: Number theory
- Replies:
**1** - Views:
**1054**

### Re: Number theory

When $k$ divides $a$ and $a+1$ then, $k$ divides $a+1-a=1$

so, $k=1$

so, $k=1$

- Thu Feb 07, 2013 10:45 pm
- Forum: National Math Olympiad (BdMO)
- Topic: BdMO National Higher Secondary 2007/7
- Replies:
**6** - Views:
**2120**

### Re: BdMO National Higher Secondary 2007/7

here, $x^7-1=f(x)\cdot(x-1)$ so, \[f(x)|(x^{42}-1),(x^{35}-1),(x^{28}-1),(x^{21}-1),(x^{14}-1),(x^7-1)\] so, the remainder will be \[7\] How does the green line lead to the red line? :? :? :?: :?: actually, what I didn't think much important to mention was this \[f(x)|x^{7}-1|x^{7n}-1\] It should b...

- Thu Feb 07, 2013 10:37 pm
- Forum: National Math Olympiad (BdMO)
- Topic: Let us help one another preparing for BdMO national 2013
- Replies:
**12** - Views:
**3979**

### Re: Let us help one another preparing for BdMO national 2013

where is the $x$ ??Shadmanmajid wrote:Problem no.3- For a positive integer n, ﬁnd the number of solutions of the congruence x

2 ≡ 1 (mod n).

- Tue Feb 05, 2013 6:54 pm
- Forum: Secondary Level
- Topic: Geometric Calculation
- Replies:
**3** - Views:
**1517**

### Re: Geometric Calculation

Li is a chinese unit

but, what is "in 2 Li" ?

but, what is "in 2 Li" ?

- Tue Feb 05, 2013 2:12 pm
- Forum: Secondary Level
- Topic: Geometric Calculation
- Replies:
**3** - Views:
**1517**

### Re: Geometric Calculation

When visiting a rectangular plantation, the foreman told you that they recently put up 28 Li of fencing around the entire plantation. Having spent hours walking the width of the plantation, you know that it is 3 Li long. What is the area ( in 2 Li ) of the plantation? I believe it is copied from an...

- Tue Feb 05, 2013 2:05 pm
- Forum: Secondary Level
- Topic: Combinatorics
- Replies:
**5** - Views:
**1734**

### Re: Combinatorics

yes. You are right. So, is mahi.Fahim Shahriar wrote: It's $7$. For $n$ distinguishable fair coins, $(n+1)$ outcomes.

now, someone edit that 'in'.

- Sun Feb 03, 2013 11:14 am
- Forum: Secondary Level
- Topic: Combinatorics
- Replies:
**5** - Views:
**1734**

### Re: Combinatorics

As they are indistinguishable, it should be $6.$