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How many of the natural numbers from $1$ to $800,$ inclusive, contain the digit $6$ at least twice? (The numbers $266$ and $663$ are two natural numbers that contain the digit $6$ at least twice, but $430$ or $16$ are not.)

 Aug 13, 2020
 #1
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66  166  266  366  466  566  606  616  626  636  646  656  660  661  662  663  664  665  666  667  668  669  676  686  696  766 >> Total =  26

 Aug 13, 2020
 #2
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That is correct!

Guest Aug 13, 2020

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