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missed last week due to illness so have no clue what this homework is going on about, the question is for each of the following state whether or not it is a subspace of R3, Justify your answer by giving a proof or a counter example in each case, i know I'm ment to attempt the question before i ask for help but i don't know where to start, if someone could tell me what i need to look for in order to tell wheather or not it is a subspace i could then have a good at it and check up my answers after? thanks