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### help!

Posted: Wed Jan 21, 2015 9:38 pm
what is the sum of the digits from 1 to 2015 ?
Ex. sum of the digits from 19 to 21 is: 1+9+2+0+2+1=15.

### Re: help!

Posted: Sat Feb 07, 2015 10:23 pm
can't anyone find the answer i cannot do it so i posted it.
N:B:logic and reason must be given.

### Re: help!

Posted: Sat Feb 07, 2015 10:49 pm
I am giving you the process of solving it.I hope you will solve it own.
We want to count the sum of the digits of the number $1234567891011.........2015$.See that the sum of the digits from $1$ to $9$ is $45$.Now,the sum of the digits from $10$ to $19$ is $10\times1+45=55$.In this process you can count the total sum.
$\text{Another way}:$
Find the number of $1's$,number of $2's$...........number of $9's$ from $1$ to $2015$.

### Re: help!

Posted: Mon Feb 16, 2015 10:12 pm
This is the 7th question of junior category Dhaka 2015. The ans is 28098.

### Re: help!

Posted: Tue Feb 20, 2018 11:07 am
Raiyan Jamil wrote:
Mon Feb 16, 2015 10:12 pm
This is the 7th question of junior category Dhaka 2015. The ans is 28098.

Why? the answer is 26600.

### Re: help!

Posted: Tue Feb 20, 2018 2:25 pm
M. M. Fahad Joy wrote:
Tue Feb 20, 2018 11:07 am
Raiyan Jamil wrote:
Mon Feb 16, 2015 10:12 pm
This is the 7th question of junior category Dhaka 2015. The ans is 28098.

Why? the answer is 26600.
No,the correct answer is $\fbox {28098}$.Calculate again ,you will get this number.

### Re: help!

Posted: Tue Feb 20, 2018 4:40 pm
samiul_samin wrote:
Tue Feb 20, 2018 2:25 pm
M. M. Fahad Joy wrote:
Tue Feb 20, 2018 11:07 am
Raiyan Jamil wrote:
Mon Feb 16, 2015 10:12 pm
This is the 7th question of junior category Dhaka 2015. The ans is 28098.

Why? the answer is 26600.
No,the correct answer is $\fbox {28098}$.Calculate again ,you will get this number.
Eta kivabe calculate korbo? Sutro ta bole diben?

### Re: help!

Posted: Tue Feb 20, 2018 4:48 pm
If you tell Bangla then use Avro.It is easy.
$(45×20×20)+(45×200)+1000+32+15+45=28098$

### Re: help!

Posted: Tue Feb 20, 2018 5:32 pm
বুঝলাম না:
(১) আপনার সূত্র
(২) একবার বলেন 28092 এবং আরেকবার 28098

### Re: help!

Posted: Tue Feb 20, 2018 5:44 pm
The main object of this forum is to make our students interested in maths. So we should not be bothered but helping each other.