The simplest, probably, is 2 + 3 + 4 - 5
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106------------------------------------------------------------------------------------------------From Rafaelrz.You can make, 4P3 = 4!/(4-3)! = 24, different 3 digit numbers using 1, 2, 3 and 4.
5! / 4 - 2 * 3
2(3 x 6) - 4 = 32 w00t
2 x ( 4(3) - 1) = 22
There are 5*4*3 = 60 such numbers.