## Combinatorics

**Moderator:** kamrul2010

### Combinatorics

How many pairs of natural number can be formed whose LCM will be 7000?This problem has been taken from bdmo regional contest. As I am a new learner,please help me solving the problem in detail.

- samiul_samin
**Posts:**1007**Joined:**Sat Dec 09, 2017 1:32 pm

### Re: Combinatorics

I think this problem should be posted @ divisional math olympiad forum.

You can get in depth solution of this problem at the book "A path to combinatorics for undergraduates " by Titu andresscu.You can easily get the pdf version of that book.

You can get in depth solution of this problem at the book "A path to combinatorics for undergraduates " by Titu andresscu.You can easily get the pdf version of that book.

### Re: Combinatorics

The problem is solved for ordered pairs in your suggested book.But I want the solution for the unordered pairs.Detailed help will be much appreciated.

- M. M. Fahad Joy
**Posts:**120**Joined:**Sun Jan 28, 2018 11:43 pm**Location:**Bhulta, Rupganj, Narayanganj-
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### Re: Combinatorics

Has there any Bangla book?samiul_samin wrote: ↑Sun Mar 25, 2018 7:04 pmI think this problem should be posted @ divisional math olympiad forum.

You can get in depth solution of this problem at the book "A path to combinatorics for undergraduates " by Titu andresscu.You can easily get the pdf version of that book.

**You cannot cross the sea merely by standing and staring at the water.**

- samiul_samin
**Posts:**1007**Joined:**Sat Dec 09, 2017 1:32 pm

### Re: Combinatorics

No,not Bangla version of this book is available.M. M. Fahad Joy wrote: ↑Tue Apr 03, 2018 6:47 pmHas there any Bangla book?samiul_samin wrote: ↑Sun Mar 25, 2018 7:04 pmI think this problem should be posted @ divisional math olympiad forum.

You can get in depth solution of this problem at the book "A path to combinatorics for undergraduates " by Titu andresscu.You can easily get the pdf version of that book.