How many keystrokes are needed to type numbers from 1 to 1000?
1)3001
2)2893
3)2704
4)2890

• 2893 key strokes are needed to type nos fom 1 to 1000
  numbers 1 to 9 require 1*9=9 key strokes
  numbers 10 to 99 require 2*90=180 key strokes
  numbers 100 to 999 require 3*900=2700 key strokes
  number 1000 needs 4 key strokes
  so adding them all 9+180+2700+4=2893 strokes
• 12 years agoHelpfull: Yes(24) No(0)
• ans is 2893
  
  9+180+2700+4
• 12 years agoHelpfull: Yes(4) No(0)
• (1*9)+(2*90)+(3*900)+(1*4)=2893
  ans is 2893
• 12 years agoHelpfull: Yes(3) No(0)
• (1*4)+(900*3)+(90*2)+(9*1)=2893
• 12 years agoHelpfull: Yes(3) No(0)
• ans is 2893..
  1*9+2*90+3*900+1*4=2893
• 12 years agoHelpfull: Yes(2) No(1)
• 1 to 9.............9 = 9
  10 to 99...........90*2 = 180
  100 to 999.........900*3=2700
  1000...............4 = 4
  +
  ------------------------------
  2893
• 12 years agoHelpfull: Yes(1) No(1)
• Ans is 2890...
  (1*9)+(2*90)+(3*899)+(1*4)=2890
• 12 years agoHelpfull: Yes(0) No(4)
• 1 to 9=9
  10 to 99=2*90=180
  100 to 999=3*900=2700
  1000=4
  9+180+2700+4=2893
• 12 years agoHelpfull: Yes(0) No(0)
• ans is 2893
  1*9=9
  2*90=180,,,, (99-9=90)
  3*900=2700,,,, (999-99)
  1*4=4
• 12 years agoHelpfull: Yes(0) No(1)
• .....2893.....
• 12 years agoHelpfull: Yes(0) No(1)
• 1-9=9+
  10-99=90*2+
  100-999=900*3+
  1000=4
  2893
• 12 years agoHelpfull: Yes(0) No(0)
• ...2893 is correct ans.
• 12 years agoHelpfull: Yes(0) No(0)