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For Geeks & Brainiacs #27- Doughnut Dilemma -

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Puzzle Image
Duncan Doughnut sells his famous
doughnuts in boxes of 6, 9, and 20.

What is the greatest number of
doughnuts that CANNOT be purchased
(in that exact amount) no matter which
boxes are purchased?
Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?
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