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Mathematics 35 Online
OpenStudy (anonymous):

determine whether or not the following subsets are subspaces of R3, explain: X=[x1,x2,x3] : x1+x2+x3=0 X=[x1,x2,x3] : x1+x2+x3=1 X=[x1,x2,x3] : x1x2x3=0 X=[x1,x2,x3] :-x1+2x2+x3=0 and x1+3x2+3x3=0

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