jake writes all 4 digit no.s.
how many no. of 2's he write?

• when the person use all the digits=9*10*10*10=9000
  when the person not use 2 then all digits=8*9*9*9=5832
  so when that person use 2 then=9000-5832=3168
• 10 years agoHelpfull: Yes(22) No(4)
• 1000+900*3=
  3700
• 10 years agoHelpfull: Yes(8) No(3)
• (9*9*9)+(8*9*9)+(8*9*9)+(8*9*9)+2(9*9+8*9+8*9+9*9+8*9+9*9)+3(9+9+8+9)+4=
  =2673+918+105+4=3700
• 10 years agoHelpfull: Yes(7) No(1)
• 9000-(8*9*9*9)=3168
• 10 years agoHelpfull: Yes(6) No(2)
• 9000-(8*9*9*9)=3168
• 10 years agoHelpfull: Yes(4) No(3)
• 10*10*10+3*9*10*10=3700
• 10 years agoHelpfull: Yes(3) No(0)
• 1000 to 1099 =19 no.s containing 2.
  1100 to 1199 =19 no.s containing 2.
  this is applicable to all but not in
  2000 to 2999 they are 1000 no.s
  hence
  total no = 1000 + 19*80 = 2520
• 10 years agoHelpfull: Yes(1) No(3)
• explain clerly plz
• 10 years agoHelpfull: Yes(0) No(1)
• how they r saying 9000 as total 4 digit nos. there are 10,000 nos from 1000 to 9999
  
  from 1000to1099=20
  1100to1199=20
  1200to1299=120
  1300ti1399=20
  .....n so on sooooo long..;)
• 10 years agoHelpfull: Yes(0) No(0)