5^2 - 3 - 4 =18
(( 2 * 5) - 4 ) * 3 =18
4 ^ 2 + 5 - 3 = 18
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How many different positive numbers (integers) can you make using each of the digits 1, 2, 3, 4, once only, and a take away sign?
Example 31-24, or 413-2
