the citizens of planet oz are 9 fingered and have thus developed their decimal system in base .A certain street in oz contains 100 buildings (in base 9) numbered 1 to 100. How many 8s are used in numbering these building (in base 10)
a)18 b)20 c)16 d)9

• Nos. containing digit 8 in numbers from 1 to 100 in base 9 are
  008,018,028,038,048,058,068,078,80,81,82,83,84,85,86,87,088
  
  so 18 .
  
  option a) 18.
• 13 years agoHelpfull: Yes(9) No(1)
• in base 10 answer should be 20........but in base 9 answer is 18
• 12 years agoHelpfull: Yes(1) No(0)
• hello dipin sir ur answer is correct but they are asking in base 10
  therefore 1 to 100 in base 9 is equal to 1 to 91 in base 10 therefore ans should be 19
• 12 years agoHelpfull: Yes(0) No(1)
• ans will be 19 mohammed sir i agree wid u
  
• 12 years agoHelpfull: Yes(0) No(0)