## help!

For students upto class 5 (age upto 12)
ahsaf
Posts: 16
Joined: Mon Jan 19, 2015 10:48 pm

### help!

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.

ahsaf
Posts: 16
Joined: Mon Jan 19, 2015 10:48 pm

### Re: help!

can't anyone find the answer i cannot do it so i posted it.
N:B:logic and reason must be given.
Men are born with the reason to help others.
But I realised they strive to become famous.

tanmoy
Posts: 288
Joined: Fri Oct 18, 2013 11:56 pm

### Re: help!

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 $2015$.
"Questions we can't answer are far better than answers we can't question"

Raiyan Jamil
Posts: 138
Joined: Fri Mar 29, 2013 3:49 pm

### Re: help!

This is the 7th question of junior category Dhaka 2015. The ans is 28098.
A smile is the best way to get through a tough situation, even if it's a fake smile.

Posts: 120
Joined: Sun Jan 28, 2018 11:43 pm
Location: Bhulta, Rupganj, Narayanganj
Contact:

### Re: help!

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

Math is the main inspiration of my life.

samiul_samin
Posts: 1004
Joined: Sat Dec 09, 2017 1:32 pm

### Re: help!

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.

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

Posts: 120
Joined: Sun Jan 28, 2018 11:43 pm
Location: Bhulta, Rupganj, Narayanganj
Contact:

### Re: help!

samiul_samin wrote:
Tue Feb 20, 2018 2:25 pm
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.

No,the correct answer is $\fbox {28098}$.Calculate again ,you will get this number.
Eta kivabe calculate korbo? Sutro ta bole diben?
Math is the main inspiration of my life.

samiul_samin
Posts: 1004
Joined: Sat Dec 09, 2017 1:32 pm

### Re: help!

If you tell Bangla then use Avro.It is easy.
$(45×20×20)+(45×200)+1000+32+15+45=28098$
Last edited by samiul_samin on Tue Feb 20, 2018 6:34 pm, edited 1 time in total.

Posts: 120
Joined: Sun Jan 28, 2018 11:43 pm
Location: Bhulta, Rupganj, Narayanganj
Contact:

### Re: help!

বুঝলাম না:
(১) আপনার সূত্র
(২) একবার বলেন 28092 এবং আরেকবার 28098
Math is the main inspiration of my life.