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(1+2) + 9 + (5+6) - (7+8) + (3+4); (3 + 9 + 11) - (15 + 7); (12 - 11) - 22; 23 - 22 = 1

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12y ago
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Q: How do you get the answer 1 by using all the digits 1 2 3 4 5 6 7 8 and 9?
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