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Postage Stamps

Question

Suppose the post office only sold 5 cent and 7 cent stamps.  Now, if the amount of postage on your mail had to be a precise amount equivalent to double of the distance (e.g. sending a letter five miles costs ten cents), what whole number locations are you not able to mail to?

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2 answers to this question

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Spoiler

1, 2, 3, 4, 8, 9

 

Edited by Pickett
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