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3) Let V be the following subspace of the 4-dimensional vector space R* V = (x,.x, X,x, e IR : x, -x, + X,-X,

3) Let V be the following subspace of the 4-dimensional vector space R* V = (x,.x, X,x," e IR" : x, -x, + X,-X, = 0,Find a basis of the subspace V and its dimenslon.

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