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That would probably depend on the poster. If they included their source material. I don't think most do.
Regarding GMAT Prep, it's unlikely all of their questions would be posted here.
No, usually the source of the question would be specified. I was talking about those tagged topics with "GMAT Prep" , clicking on them should provide me a mixture of SC, CR and RC instead of getting me only SC or only CR or only RC topics. Trying clicking on one of those tags and you will get what I am trying to say.