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Kris has an endless supply of 4-cent and 7-cent stamps for mailing a package. What is the greatest amount of postage that cannot be affixed to a package using these stamps?

  • math -

    basically what is the gcm that these canot be..
    easiest way...make a list
    4,7,8,11,12,14,15,16,18,19,20,21,22,..... so the highest # is 17

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