BdMO National 2021 Primary Problem 3

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Anindya Biswas
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BdMO National 2021 Primary Problem 3

Unread post by Anindya Biswas » Mon Apr 12, 2021 9:24 pm

$1^2,2^2,3^2,\cdots,2021^2$ সংখ্যাগুলোর মধ্যে কতগুলো সংখ্যার এককের ঘরের অঙ্ক $1$?

How many numbers out of $1^2,2^2,3^2,\cdots,2021^2$ have a $1$ in its units place?
"If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is."
John von Neumann

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Swapnil Barua
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Re: BdMO National 2021 Primary Problem 3

Unread post by Swapnil Barua » Tue Apr 13, 2021 7:43 pm

1² to 10² 2 numbers has 1 in it's unit place
1² to 2021² 405 numbers has 1 in it's unit place

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