Question 935157

{{{(((9999-1001)/11) + 1) / ( 9999-999 )=819/9000= 91/1000=0.091}}}

or,

there are {{{819}}} multiples of {{{11}}} between {{{1001}}} and {{{9999}}}, and the total number of 4-digit numbers are {{{9000}}}: so, simply divide {{{819/9000= 0.091}}}