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How many of the natural numbers from 1 to 800 inclusive, contain the digit 6 at least once?

 Jul 25, 2021
 #1
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for the 600's there is 100 such numbers  (600 THRU 699)

  for each other 100 there are 20 such numbers (example   006  16  26 36 46 56 66  76 76 86 96 60 61 62 63 64 65     67 68 69) 

        000, 100, 200,300,400,500,700's

 

  100      +      7 x 20 = 240  numbers have at least one 6     

 Jul 25, 2021

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