AoPS Wiki:Problem of the Day/July 6, 2011
< AoPS Wiki:Problem of the Day
Revision as of 22:00, 5 July 2011 by Btilm305 (talk | contribs) (Protected "AoPSWiki:Problem of the Day/July 6, 2011": Problem of the Day ([edit=sysop] (indefinite) [move=sysop] (indefinite)))
Find the sum $1+11+\cdots+\underbrace{111\cdots 111}_{n}}$ (Error compiling LaTeX. Unknown error_msg).