Respuesta :

from numbers 1 to 9  =    9 digits
 ..        ....  ....  10-99  = 2*100 =200 digits
  ..  ..  .. .. ...   100-699 = 3*600 = 1800 digits
   Total = 2009 digits

2009 - 1994  = 15 digits  less which = 5 numbers

So the last number would be 699 - 5 = 694