How many 5's are there in the number 121122123...till 356

• 121122123... till 356
  121,122,123,124... till 356
  
  121 to 200 => 125,135,145, from 150 to 159 => 11 5's , 165,175,185,195
  [from 150 to 159, each no. has 1 no. of 5 except 155, 155 has 2 no. of 5]
  total=18
  
  201 to 300 => 205,215,225,235,245, 250 to 259 => 11 5's , 265,275,285,295
  => total=20
  
  301 to 356 => 305,315,325,335,345,350,351,352,353,354,355(2 5's),356
  => total=13
  
  total no. of 5's = 18 + 20 + 13 = 51
  
• 10 years agoHelpfull: Yes(42) No(0)
• the no. includes 5 from 121 to 200 are (125,135,145,150 to 159,165,175,185,195)
  no. of 5's are = 18 (because 155 has two 5's)
  
  from 201 to 300 (205,215,225,235,245,250 to 259,265,275,285,295)
  no of 5's are =20
  
  from 301 to 356 (305,315,325,335,345,350 to 356)
  no. of 5's are 13
  
  hence ans is 18+20+13=51
• 10 years agoHelpfull: Yes(2) No(0)
• its in the form of 121 122 123 124 and so on...
  so simply calculate the number of 5's
  125,135,145,150,155,165,175,185,195,205,215,225,235,245,250,255,265,275,285,295,305,315,325,335,345,350,355..
  so altogeter there are 30 5's
  
• 10 years agoHelpfull: Yes(1) No(5)
• Answer is :51
• 10 years agoHelpfull: Yes(1) No(1)
• 48 times
  given series is 121 122 123 124.....356
  121 to 200 7+11=18(125,135,145,65,175,185,195)+(150,151,152,153,154,155,156,157,158,159)
  201 to 300 9+11=20
  301 to 356 5+8=13
  total 5=51ans.
• 10 years agoHelpfull: Yes(1) No(1)
• my ans is 30
• 10 years agoHelpfull: Yes(0) No(5)
• Yes its 51 only
  
• 10 years agoHelpfull: Yes(0) No(0)
• (8+1)+(10+1)+(5+1)=26
• 10 years agoHelpfull: Yes(0) No(2)