To type the digits from 1-1000 how many key strokes are needed?

• 9 numbers have only one digit.
  90 numbers have two digits.
  900 numbers have three digits.
  one number has four digits.
  
  Total number of digits = (9x1)+(90x2)+(900x3)+4 = 2893 digits
  
  so 2893 strokes (excluding 999 spaces in between )
• 12 years agoHelpfull: Yes(3) No(0)
• 1 - 9 = 9 strokes
  10 - 99 = 2*90 = 180 strokes
  100 - 999 = 900 * 3 = 2700 strokes
  1000 = 4 strokes
  
  So total no. of strokes from 1 - 1000 = 9 + 180 + 2700 + 4 = 2893
• 12 years agoHelpfull: Yes(1) No(0)
• answer :: 2893
  sol::
  1-9 are one digit no. ,total no. of clicks 9*1= 9
  10-99 are two digit no. ,total no. of clicks 90*2= 180
  100-999 are three digit no. ,total no. of clicks900*3= 2700
  1000 is four digit no. ,total no. of clicks 1*4= 4
  total :: 9+180+2700+4 = 2893
• 12 years agoHelpfull: Yes(0) No(0)