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Given four vectors aj = 1 a2 = 3 as = -3 4 -1 , and b = 0 , work out the following problems: X2 - X-16 (1) For which value(s) of A e R, b can be expressed as a linear combinations of a1, d2 and ag? (2) When the linear combination in (1) is unique. Please give the explicit linear combination. (3) For which value(s) of A e R, b cannot be expressed as a linear combination of a1, a2 and a3