## Dhaka Higher Secondary 2011/8

**Forum rules**

Please

**don't post problems (by starting a topic)**in the "Higher Secondary: Solved" forum. This forum is only for showcasing the problems for the convenience of the users. You can post the problems in the main Divisional Math Olympiad forum. Later we shall move that topic with proper formatting, and post in the resource section.

- bristy1588
**Posts:**92**Joined:**Sun Jun 19, 2011 10:31 am

### Re: Dhaka Higher Secondary 2011/8

Can Aanyone tell me why i m wrong and what is the correct answer?

Bristy Sikder

- nafistiham
**Posts:**829**Joined:**Mon Oct 17, 2011 3:56 pm**Location:**24.758613,90.400161-
**Contact:**

### Re: Dhaka Higher Secondary 2011/8

হায় হায়! ফাহিম ভাইয়ারও এই উত্তর আসছে । আমি কয়েকজনকে তো এভাবেই দেখালাম । কিন্তু কিভাবে হবে ? এই টপিকে তো কোথাও সমাধানটা নাই ।

\[\sum_{k=0}^{n-1}e^{\frac{2 \pi i k}{n}}=0\]

Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.

Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.

- bristy1588
**Posts:**92**Joined:**Sun Jun 19, 2011 10:31 am

### Re: Dhaka Higher Secondary 2011/8

Tiham, Fahim er Solution ta ki??nafistiham wrote:হায় হায়! ফাহিম ভাইয়ারও এই উত্তর আসছে । আমি কয়েকজনকে তো এভাবেই দেখালাম । কিন্তু কিভাবে হবে ? এই টপিকে তো কোথাও সমাধানটা নাই ।

Bristy Sikder

### Re: Dhaka Higher Secondary 2011/8

I've got $6(115\cdot 146+11\cdot 147)$.

Really confused...

Please post your full solutions.... I'll post mine tomorrow.

Really confused...

Please post your full solutions.... I'll post mine tomorrow.

Please

**Install $L^AT_EX$ fonts**in your PC for better looking equations,**Learn****how to write equations**, and**don't forget**to read**Forum Guide and Rules.****"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Sherlock Holmes**- nafistiham
**Posts:**829**Joined:**Mon Oct 17, 2011 3:56 pm**Location:**24.758613,90.400161-
**Contact:**

### Re: Dhaka Higher Secondary 2011/8

unfortunately, my solution is so long that i hardly can even write it in my exercise book.so, i am trying to shorten it.whenever i can, i'll post

\[\sum_{k=0}^{n-1}e^{\frac{2 \pi i k}{n}}=0\]

Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.

Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.

### Re: Dhaka Higher Secondary 2011/8

Here's my proof... (short version)

Last edited by Labib on Thu Dec 15, 2011 3:52 pm, edited 1 time in total.

Please

**Install $L^AT_EX$ fonts**in your PC for better looking equations,**Learn****how to write equations**, and**don't forget**to read**Forum Guide and Rules.****"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Sherlock Holmes**### Re: Dhaka Higher Secondary 2011/8

Alright! done editing and the solution's ready to go...

Waiting for others to post their solution.

Waiting for others to post their solution.

Please

**Install $L^AT_EX$ fonts**in your PC for better looking equations,**Learn****how to write equations**, and**don't forget**to read**Forum Guide and Rules.****"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Sherlock Holmes**-
**Posts:**6**Joined:**Sun Jan 05, 2014 5:27 pm

### Re: Dhaka Higher Secondary 2011/8

i've got $N=2^6 \cdot 3^2 \cdot 37$

### Re: Dhaka Higher Secondary 2011/8

I think the solution should be $2^6.3^2.37$. But it doesn't seem to fit with the problem statement.

Ignore my previous stupid posts btw.

Ignore my previous stupid posts btw.

**Install $L^AT_EX$ fonts**in your PC for better looking equations,

**Learn**

**how to write equations**, and

**don't forget**to read

**Forum Guide and Rules.**