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A solution which is accessible with very basic arithmetic and minimal mental effort, is11 = 3/3 +3/3 +3/3 + ... + 3/3 (eleven times, using 22 threes),

12 = 3/3 +3/3 +3/3 + ... + 3/3 + 3/3 (twelve times, using 24 threes), and so on.

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Q: How do you get the numbers 11-20 using only 3?
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