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So I have noticed that there are exact solutions to the exact question I found on an assignment sheet for a unit/class that I am currently doing (the source is from another college's publication on their own assignment). My question is that: is my professor allowed to use this particular question (which is identical in every way, even the wording) in an assignment given to us? Does this not count as being academically dishonest on the professor's part? I know that if I use these solutions it is plagiarism, but isn't using this question in an assignment given to us without any citations or references to the original source, counted as plagiarism on the professor's part?