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At the most basic level, dividing each of the numbers by themselves gives you 1 (e.g., 9/9 = 1, 18/18 = 1, -2/-2 = 1).

If a more interesting solution is needed though, the following formula produces the answer of 1 using the four values provided:

(18 / 9) + - 2 + 1 = 1

(2) + (-2) + 1 = 1

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13y ago
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Q: How do you get 1 with negative 2 or 1or 9 or18?
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