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As Easy As 1234

Problem

Using each of the digits 1, 2, 3, and 4, once and only once, with the basic rules of arithmetic (+, –, times, ÷, and parentheses), express all of the integers from 1 to 25.

For example, 1 = 2 times 3 – (1 + 4)

Problem ID: 13 (Sep 2000)     Difficulty: 1 Star

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