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The most obvious way works: two quarters and a nickel.
One way is 2*4! + 3 - 1 = 2*24 + 3 - 1 = 48 + 3 - 1 = 50
Easier than what? The easiest way to produce a three-digit number that is a multiple of 3 (has 3 as a factor) is to make sure the digits total to a multiple of 3. 123, 555, 498 are all multiples of 3.
The only way that you would do that is if you make a huge big mistake.