help!
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 $2015$.
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 $2015$.
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Re: help!
This is the 7th question of junior category Dhaka 2015. The ans is 28098.
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- M. M. Fahad Joy
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Re: help!
Raiyan Jamil wrote: ↑Mon Feb 16, 2015 10:12 pmThis is the 7th question of junior category Dhaka 2015. The ans is 28098.
Why? the answer is 26600.
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Re: help!
No,the correct answer is $\fbox {28098}$.Calculate again ,you will get this number.M. M. Fahad Joy wrote: ↑Tue Feb 20, 2018 11:07 amRaiyan Jamil wrote: ↑Mon Feb 16, 2015 10:12 pmThis is the 7th question of junior category Dhaka 2015. The ans is 28098.
Why? the answer is 26600.
- M. M. Fahad Joy
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Re: help!
Eta kivabe calculate korbo? Sutro ta bole diben?samiul_samin wrote: ↑Tue Feb 20, 2018 2:25 pmNo,the correct answer is $\fbox {28098}$.Calculate again ,you will get this number.M. M. Fahad Joy wrote: ↑Tue Feb 20, 2018 11:07 amRaiyan Jamil wrote: ↑Mon Feb 16, 2015 10:12 pmThis is the 7th question of junior category Dhaka 2015. The ans is 28098.
Why? the answer is 26600.
You cannot cross the sea merely by standing and staring at the water.
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Re: help!
If you tell Bangla then use Avro.It is easy.
$(45×20×20)+(45×200)+1000+32+15+45=28098$
$(45×20×20)+(45×200)+1000+32+15+45=28098$
Last edited by samiul_samin on Tue Feb 20, 2018 6:34 pm, edited 1 time in total.
- M. M. Fahad Joy
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Re: help!
বুঝলাম না:
(১) আপনার সূত্র
(২) একবার বলেন 28092 এবং আরেকবার 28098
(১) আপনার সূত্র
(২) একবার বলেন 28092 এবং আরেকবার 28098
You cannot cross the sea merely by standing and staring at the water.
- M. M. Fahad Joy
- Posts:120
- Joined:Sun Jan 28, 2018 11:43 pm
Re: help!
The main object of this forum is to make our students interested in maths. So we should not be bothered but helping each other.
You cannot cross the sea merely by standing and staring at the water.