BdMO National 2021 Primary Problem 3
Posted: 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?
How many numbers out of $1^2,2^2,3^2,\cdots,2021^2$ have a $1$ in its units place?