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HINT: Once you can make four consecutive numbers, you can make any number (by adding 4).

See Answer

ANSWER: 17. As it's possible to make the numbers 18, 19, 20, and 21, any higher number can just be made by adding a multiple of 4. A clever shortcut is to multiply the two numbers together and then subtract both numbers from the result as in: (7 * 4) - 7 - 4 = 17.

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