(a) Do v1. v2, v3, v4 span R3? Why or why not?
(b) Are v1. v2. v3, v4 linearly independent? Why or why not?
(c) Do v1, v2, v3, v4 form a basis for R3? Why or why not? If not, is it possible to choose some subset which is a basis?
(d) What is the dimension of the span of v1, v2, v3, v4? Justify your answer.
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