The US Citizens are 8 fingered and have thus developed their decimal system in base 8. A certain street in US contains 1000 (in base buildings numbered 1 to 1000. How many 3s are used in numbering these buildings?

256

54

192

64

From 1 to 1000 number of 3,s are 300. Since they mentioned 8 fingered we have to take base 8. i.e., (3*(8^2))+(0*(8^1))+(0*(8^0))=192 answer is 192

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