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What is the greatest amount of postage you would not be able to pay using only a combination of seven cent and seventeen cent stamps?

I have done a similar problem and got it correct but I am just wondering if there are other ways to do this. Please help me out thanks

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    See http://www.artofproblemsolving.com/Wiki/index.php/Chicken_McNugget_Theorem2012-12-19
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    How can we know whether there are "other ways" when we don't know what your way was?2012-12-20

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