[tex]\displaystyle\bf\\Cel~mai~mare~numar~de~1994~cifre~care~contine~1000~de~cifre~de~1\!\!:\\\\\boxed{\bf\underbrace{999...999}_{994~de~9}\underbrace{111...111}_{1000~de~1}}\\\\\\Cel~mai~mic~numar~de~1994~cifre~care~contine~1000~de~cifre~de~1\!\!:\\\\\boxed{\bf1\underbrace{000...000}_{994~de~0}\underbrace{111...111}_{999~de~1}}[/tex]