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24/05/2018 at 09:56
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How many integers between 100 and 1000 contain no digits other than 3, 4 or 5?



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    Huy Toàn 8A (TL) 25/05/2018 at 03:03

    There are 2 cases
    Cases 1 : The number 3 digit number does not contain the number 3,4,5 in it
    Cases 2 :  contains one or two digits

     Case 1 or 2



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