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Number Puzzle #13- Sevens And Fours -

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Puzzle Image
Imagine a card with a 7 on one side and a 4 on the other side. If you were to flip the card in the air and keep a running total of the value of the card each time it lands, what's the highest whole number that cannot be made?
Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?