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Vectors & Spaceshard
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What is the dimension of the subspace of R4\mathbb{R}^4R4 spanned by {(1,1,0,0),(0,0,1,1),(1,1,1,1)}\{(1, 1, 0, 0), (0, 0, 1, 1), (1, 1, 1, 1)\}{(1,1,0,0),(0,0,1,1),(1,1,1,1)}?