Sum: You must use the same SINGLE-digit 3 times in a simple addition that has 12 as its total. Do not add four digits together. Do not use equations with parentheses. Avoid negative numbers. Do not use 4, 3, 2, 6, or 9. Which digit can you use then?
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Answer:
A single digit number times 3 must equal 12, let's try:
1 + 1 + 1 = 3. Wrong solution.
"do not use 2, 3, 4, 6, 9".
5 + 5 + 5 = 15. Wrong solution.
7 + 7 + 7 = 21. Wrong solution.
8 + 8 + 8 = 24. Wrong solution.
Answer: Unless the answer is in another base, it's impossible.
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