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Your rules of what to do are vague. And I don't think you mean "...and subtract FROM the remaining 4th number." I think you don't mean for the word "from" to be in there. You're talking about "digits," not "numbers." The following sentence doesn't make sense and/or is redundant: "All four numbers [read: digits] cannot be [the] same[.] and not all can be zero[.]" A zero *is* already included in the first part of the sentence. Supposedly these would be examples of yours: 4321 ----> 4 + 3 + 2 + 1 = 10 0505 ----> 0 + 5 + 0 + 5 = 10 8642 ----> (8 X 6)/4 - 2 = 48/4 - 2 = 12 - 2 = 10