The citizens of planet Oz are 4 fingered and thus have developed a number system in base 4. A certain street in Oz contains 100 buildings numbered from 1 to 100. How many 1's are used in numbering these buildings? Express your answer in base 10.
in the question they have mentioned it as "base 4", so we should take numbers from from 0 to 4, so take the number series as:
41,42,43,44, hence in abv series ter are 8 2s.
(since the base is 4 consider the number series only till 40's.
if base 8 then consider till 80's and so on........)
or the question can also be solved by using formula.... 2*n ==> 2*4=8
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