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1992 OIM Problems/Problem 1

Revision as of 12:53, 13 December 2023 by Tomasdiaz (talk | contribs) (Created page with "== Problem == For each positive integer 4n<math>, let </math>a_n<math> be the last digit of the number. </math>1+2+3+\cdots +n<math>. Calculate </math>a_1 + a_2 + a_3 + \cdots...")
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Problem

For each positive integer 4n$, let$a_n$be the last digit of the number.$1+2+3+\cdots +n$. Calculate$a_1 + a_2 + a_3 + \cdots + a_{1992}$.

~translated into English by Tomas Diaz. ~orders@tomasdiaz.com

Solution

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See also

https://www.oma.org.ar/enunciados/ibe7.htm

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